OB GYN

Ob-Gyn questions? Ask a gynecologist online.

Ask a Doctor,
Get an Answer ASAP!

OB GYN

Is it possible to have a false negative on a pregnancy test…

Customer Question
Is it possible to have...
Is it possible to have a false negative on a pregnancy test 30,32,36, and 37 days after sex?
Submitted: 6 months ago.Category: OB GYN
Show More
Show Less
Ask Your Own OB GYN Question
Answered in 27 minutes by:
8/3/2017
OB GYN Doctor: Dr Uzair, Doctor replied 6 months ago
Dr Uzair
Dr Uzair, Doctor
Category: OB GYN
Satisfied Customers: 9,233
Experience: MBBS, years of experience in the field of Surgery and Emergency Medicine.
Verified

Hello, my name is***** and I shall be assisting you today. I'm reviewing your query & will get back to you shortly. Thank you for your patience.

Ask Your Own OB GYN Question
OB GYN Doctor: Dr Uzair, Doctor replied 6 months ago

No, it is least likely. Almost zero chance.

Hope this helps.
Please do not forget to leave a positive rating for the service by clicking on the stars on top of the screen.

Have a good one.

Ask Your Own OB GYN Question
Customer reply replied 6 months ago
Ok so even if you have early pregnancy symptoms but have negative tests then that means there is no chance for pregnancy?
OB GYN Doctor: Dr Uzair, Doctor replied 6 months ago

Yes, that is right.

Hope this helps.
Please do not forget to leave a positive rating for the service by clicking on the stars on top of the screen.

Have a good one.

Ask Your Own OB GYN Question
Customer reply replied 6 months ago
This is why I am confused. Saw these on some forums online. Don't understand how it is possible
Customer reply replied 6 months ago
Look at dana_84
OB GYN Doctor: Dr. J, Board Certified OB/GYN replied 6 months ago
Dr. J
Dr. J, Board Certified OB/GYN
Category: OB GYN
Satisfied Customers: 411
Experience: Gynecologist
Verified

Hi there. Board-certified obgyn here. First, it's really hard to trust what people are saying in an online forum, because we don't have access to the actual medical facts. I have taken care of thousands of pregnant women and despite hearing many stories such as what's being shared on the online forums, I have never, ever personally seen it. Now that being said, I never say never, so probably in the history of the world a strange phenomenon like this has occurred, though probably far less often than people talk about it.

Secondly, let's discuss when a pregnancy test would turn positive. In order for a pregnancy to occur, a sperm must meet an egg. If a woman is having a period about once a month, that means she "ovulates" (releases an egg) about once a month. That egg is "viable", meaning able to survive and be fertilized (ie, get pregnant) for about 48 hours. Sperm, on the other hand, can survive for, at the very longest, 7 days inside a woman's reproductive tract. We also know that most pregnancies will have a positive urine pregnancy test (the test where you pee on a stick) within 14 days after fertilization, right around the time when you would be expecting a period, if you were someone who has a monthly period.

So, in theory, one could have intercourse and have sperm released into the reproductive tract, then ovulate 7 days later, and get pregnant despite having had sex a full 7 days prior. Adding in the 14 days it takes for a pregnancy test to turn positive, this totals 21 days after sex, at the very latest, that you would be testing positive for pregnancy.

All that being said, if your period is late and you are very worried about pregnancy ...bloodwork does not lie. Urine pregnancy tests expire, can be mishandled, or the test may not be run appropriately, but bloodwork is a very accurate way to test for pregnancy. So if you are worried about pregnancy, your period is late, and your pregnancy tests are all negative, some bloodwork may ease your mind. Hope this answer helps!

Ask Your Own OB GYN Question
Customer reply replied 6 months ago
Thank you for going so in depth. I guess I will go ahead and tell you the full story so you can have a better understanding of my situation. So my girlfriend and I had an accident on June 27 and she took plan b immediately afterwards. She got her period 3 days later and it lasted for 7 days, with 2 of those days being just spotting. For the past 6 days she has been feeling really bad. Having some early pregnancy symptoms, the most prominent one is the nausea. She has taken 6 pregnancy tests. One at a doctors office Tuesday morning, which was 37 days after sex. Today is day 35 of her cycle and she still hasn't got her period. Last month she had a 35 day cycle. With that being said, she is also irregular and she has been stressing this month and also has not been eating hardly anything the past week or two
OB GYN Doctor: Dr. J, Board Certified OB/GYN replied 6 months ago

Ah I see. Ok. Does she know when her period started in June? What I'm trying to get at is where she was in her cycle when the accident occurred.

Ask Your Own OB GYN Question
Customer reply replied 6 months ago
She was on day 32 of her cycle when it happened
Customer reply replied 6 months ago
I know that means that she shouldn't have been fertile but it's hard to know since she is irregular
OB GYN Doctor: Dr. J, Board Certified OB/GYN replied 6 months ago

What you're telling me is very reassuring. I think you guys are in the clear. I understand that she has irregular cycles so it's impossible to know when she ovulated in June, but we know that Plan B prevents 7 out of 8 pregnancies. The way that Plan B works is by delaying ovulation. The idea is, sperm can hang out for up to a week. So after an act of unprotected intercourse, you want to delay ovulation far enough out that any sperm in there will lose viability before you actually ovulate. If Plan B is not effective at preventing a pregnancy, it's usually because the woman ovulated in the 1-2 days prior to intercourse. So, it can't delay ovulation if ovulation has literally just occurred.

Just statistically speaking, a lot of very unlikely things would ALL have to have happened in order for there to be a pregnancy - your girlfriend would have to have ovulated VERY late in the cycle (a Day 30 ovulation. Usually ovulation occurs Day 12-16ish, and in someone with a 35 day cycle, ovulation would be around Day 21), AND Plan B would have to fail, AND all those pregnancy tests would have to be falsely negative. I believe in data, and the data is telling me you're in the clear. May I also add that taking Plan B will worsen irregular periods. The fact that she had a bleed after taking Plan B is very reassuring that the Plan B did its job - a big dose of progesterone which (in addition to delaying ovulation) causes the uterine lining to shed and bleed. I'm not surprised that her period isn't on time this month, because Plan B can throw things out of wack. I think you guys are OK. Hang in there!

Ask Your Own OB GYN Question
Customer reply replied 6 months ago
Ok thank you for always being so in depth. That is what I was thinking but with the early pregnancy symptoms and no period yet I can't help but be worried.
OB GYN Doctor: Dr. J, Board Certified OB/GYN replied 6 months ago

Again, having her doc order bloodwork (a quantitative hcg level) might do a lot to put you at ease. But also, many symptoms of the luteal phase (the phase in the cycle after ovulation, before a period actually starts) reflect the high level of progesterone at that time - nausea, bloating, increased appetite, mood changes etc. Progesterone is also the predominant hormone of pregnancy, so we see many of those symptoms in pregnancy as well.

Ask Your Own OB GYN Question
Customer reply replied 6 months ago
Ok I thought about seeing if she would get blood work but she thinks that is stupid since she had a period and she has taken 6 tests
Customer reply replied 6 months ago
Would you recommend that I tell her to get a quantitative hcg blood test done? Still no period. And she feels nauseous after she eats. She still hasn't been eating much. Her doctor prescribed her some stomach medicine about 5 days ago and she takes that after she eats something and that helps.
Customer reply replied 6 months ago
Please respond. You have been so helpful
OB GYN Doctor: Dr. J, Board Certified OB/GYN replied 6 months ago

Hi there. My apologies, I was away from my computer over the weekend.

In response to your question, I think a blood serum quantitative HCG measurement is not a bad idea even with a negative urine pregnancy test. The most likely scenario is that this is her irregular periods just being irregular and unpredictable, but bloodwork will do a lot to put you both at ease.

Ask Your Own OB GYN Question
Customer reply replied 6 months ago
Thank you for responding. I told her about doing a blood test and she said no because she doesn't think she should spend money on that since she has Gotten negative tests. I wish she would get a blood test. I mean I do kind of agree with her though with the fact that I don't understand how it is possible to get 6 false negative tests that claim to be 99.9% accurate
Was this answer helpful?
Ask Dr. J Your Own Question
Dr. J
Dr. J
Dr. J, Board Certified OB/GYN
Category: OB GYN
Satisfied Customers: 411
411 Satisfied Customers
Experience: Gynecologist

Dr. J is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I feel so much better today, and upon further investigation believe that there is a chance that the responses I got saved me from a serious, even life threatening situation. I am very grateful to the experts who answered me.

Susan O.USA

I can go as far as to say it could have resulted in saving my sons life and our entire family now knows what bipolar is and how to assist and understand my most wonderful son, brother and friend to all who loves him dearly. Thank you very much

Corrie MollPretoria, South Africa

I thank-you so much! It really helped to have this information and confirmation. We will watch her carefully and get her in for the examination and US right away if things do not improve. God bless you as well!

ClaudiaAlbuquerque, NM

Outstanding response time less than 6 minutes. Answered the question professionally and with a great deal of compassion.

KevinBeaverton, OR

Suggested diagnosis was what I hoped and will take this info to my doctor's appointment next week.
I feel better already! Thank you.

ElanorTracy, CA

Thank you to the Physician who answered my question today. The answer was far more informative than what I got from the Physicians I saw in person for my problem.

JulieLockesburg, AR

You have been more help than you know. I seriously don't know what my sisters situation would be today if you had not gone above and beyond just answering my questions.

John and StefanieTucson, AZ

< Previous | Next >

Meet the Experts:

Dr. C.

Dr. C.

Board Certified

2,537 satisfied customers

30 years of experience and an award-winning educator.

Monika Hearne, M.D.

Monika Hearne, M.D.

Board Certified OB/GYN

5,752 satisfied customers

With experience and compassion, I treat my patients like family.

Dr. Charles

Dr. Charles

OB/GYN (Doctor)

142 satisfied customers

Board Certified. Solo practice for 8 years; delivered more than 1300 infants and performed more than 800 surgeries.

Dr. K.

Dr. K.

MD

2,351 satisfied customers

Board certified OB/GYN with 20 years of experience.

DR PRABIR KUMAR DAS

DR PRABIR KUMAR DAS

CONSULTANT GYNAECOLOGIST

1,651 satisfied customers

MBBS(CAL)MD(G&O)

Dr.JBB

Dr.JBB

Board Certified OB/GYN

1,293 satisfied customers

15 yrs experience in Women's Health, Pelvic reconstruction and Incontinence

Dr. Lawrence

Dr. Lawrence

OB/GYN

822 satisfied customers

Board Certified OB/GYN and accomplished educator

< Previous | Next >

Related OB GYN Questions
54 days since last period. 3 pregnancy tests 1 turned
54 days since last period. 3 pregnancy tests 1 turned positive after some time other 2 negative. 49 years old. Could I be pregnant?… read more
Dr.M.D.Mazumdar
Dr.M.D.Mazumdar
Consultant Gynecologist
MBBS. MD (Obstetrics and Gynecology
3,689 satisfied customers
I just took a pregnancy test February 7th and it came out
I just took a pregnancy test February 7th and it came out positive... the first day of my last period was January 8th... me and my boyfriend have been trying to get pregnant ..on the night of the 25th… read more
Dr SS
Dr SS
Doctoral Degree
12,327 satisfied customers
I live in Georgia and I took a pregnancy test and I think I
I live in Georgia and I took a pregnancy test and I think I am pregnant. I tried to see my gynecologist and she won't see me until I am 6-8 weeks pregnant and I don't know how pregnant I am . I don't … read more
Dr. Huynh
Dr. Huynh
Assistant Medical Director
Doctoral Degree
115 satisfied customers
If a girl takes a pregnancy test, what's the earliest it can
If a girl takes a pregnancy test, what's the earliest it can detect a pregnancy? For example. 1 day after sex I assume the test wouldn't be able to detect anything. What would be the minimum amount of… read more
Dr Josh
Dr Josh
Doctor
B.A.M.S.
6,687 satisfied customers
My period is 2 days late- Negative pregnancy test. However
OK -So my period is 2 days late- Negative pregnancy test. However had sex 5 days ago...What should I do? … read more
Dr.M.D.Mazumdar
Dr.M.D.Mazumdar
Consultant Gynecologist
MBBS. MD (Obstetrics and Gynecology
3,689 satisfied customers
My doctor has don't a blood pregnancy test on me 3 time and
my doctor has don't a blood pregnancy test on me 3 time and it came up positive but my pregnancy hormone is under a 2???? and I am not showing any other signs I went to the hosiple for pain and they t… read more
Dr. Tim, MD
Dr. Tim, MD
Board-Certified OB/GYN
663 satisfied customers
Missed period for over 2 months, pregnancy test and
Missed period for over 2 months, pregnancy test and ultrasound is negative but I feel pregnant and my belly is popping out. Can I take gynaecosid to get my period back? … read more
Dr. K.
Dr. K.
MD
2,351 satisfied customers
I'm thinking I am pregnant but no positive pregnancy test as
Hi! I'm thinking I am pregnant but no positive pregnancy test as of yet. Conception date 12/4/17. I was on birth control and ended my pack of pills that month too. I thought i started a period around … read more
Dr. J
Dr. J
Board Certified OB/GYN
411 satisfied customers
I did an IVF cycle. I got a positive pregnancy test and I
I did an IVF cycle. I got a positive pregnancy test and I stopped progesterone and estrogen supplements shortly afterwards. One day after stopping, I started bleeding heavily, but my pregnancy test wa… read more
Dr. J
Dr. J
Board Certified OB/GYN
411 satisfied customers
I am 48, Not recently. I did a pregnancy test was negative I
Not recently. I did a pregnancy test was negative I am 9 days late … read more
Dr. Thomas, MD
Dr. Thomas, MD
2,227 satisfied customers
I had a positive pregnancy test on Tuesday and another this
I had a positive pregnancy test on Tuesday and another this morning - my period was due today. First thing this morning I noticed a slightly brown tinge to my cervical mucous, and this has happened a … read more
Dr Uzair
Dr Uzair
Doctor
9,233 satisfied customers
My wife had two positive pregnancy tests in the same day two
My wife had two positive pregnancy tests in the same day two days ago. Today, she had two negative tests. Same brand each time. She is four days late, and has multiple physical signs of pregnancy. Cou… read more
Dr Anil Kumar
Dr Anil Kumar
M.B.B.S
2,730 satisfied customers
I took a pregnancy test and after 10 minutes it said
Hi, I took a pregnancy test and after 10 minutes it said negative, but I looked at it an hour later and it said positive. I bought some more tests and plan to take them tuesday, but what do you think … read more
Dr. J
Dr. J
Board Certified OB/GYN
411 satisfied customers
I spotted 6days post ovulation with mild cramps that lasted
I spotted 6days post ovulation with mild cramps that lasted about a week and a half, with my body temp elevating, had dizziness, been very tired lately and super sore breast, tingly nipples and I spot… read more
Dr.Saleem
Dr.Saleem
Consultant Cardiologist
Doctoral Degree
773 satisfied customers
Is their an early pregnancy after 3 days of unprotected Sex
Is their an early pregnancy after 3 days of unprotected Sex you can take I was ovulating at the time… read more
Dr. K.
Dr. K.
MD
2,351 satisfied customers
I just had an ultrasound done - early pregnancy 9 weeks and
Hello, I just had an ultrasound done - early pregnancy 9 weeks and the tech told me that there's some fluid in my cervix. I've felts some pains in the area just above my pelvic bone so I am a bit worr… read more
Dr. David
Dr. David
Radiation Oncology Attending Director
Post-Doctoral Degree
13,120 satisfied customers
My girlfriend took a pregnancy test this past Sunday. The
Hello Goodmorning,My girlfriend took a pregnancy test this past Sunday. The test came back negative. However she's 8 days late and she still hasn't had her period. She said she's been nauseous after s… read more
Dr Anil Kumar
Dr Anil Kumar
M.B.B.S
2,730 satisfied customers
My girlfriend took a pregnancy test this past Sunday. The
Hello Goodmorning,My girlfriend took a pregnancy test this past Sunday. The test came back negative. However she's 8 days late and she still hasn't had her period. She said she's been nauseous after s… read more
Dr. Arun Phophalia
Dr. Arun Phophalia
Consultant Surgeon and Sports Medicine
Post-Doctoral Degree
33,157 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x