OB GYN

OB-GYN questions? Ask a gynecologist online.

Ask a Doctor,
Get an Answer ASAP!

How accurate is a pregnancy test if it was taken 21 days…

Customer Question
How accurate is a pregnancy...
How accurate is a pregnancy test if it was taken 21 days after sex? My gf took plan b immediately after intercourse and got her period 3 days afterwards.
Submitted: 10 months ago.Category: OB GYN
Show More
Show Less
Ask Your Own OB GYN Question
Answered in 3 minutes by:
7/23/2017
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 10 months ago
Dr. Norm S.
Dr. Norm S., Board Certified OB/GYN
Category: OB GYN
Satisfied Customers: 11,301
Experience: Over 30 years of experience in OB/GYN practice, including teaching students. Fellow of American Board of Obstetrics and Gynecology.
Verified

A good pregnancy test will always be positive 21 days after sex if pregnancy occurred.

The fact that she got her period 3 days after (If it seemed like a real period) is also good evidence that pregnancy did not occur.

I don't think there is any significant chance that your girlfriend is pregnant. Best regards.

Ask Your Own OB GYN Question
Customer reply replied 10 months ago
Ok well she has been feeling tired lately but has been having trouble sleeping. She has also had some lower back pain and I think her breasts have gotten a little bigger. Should she take another test ?
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 10 months ago

It's probably worthwhile to do another pregnancy test, just to be sure. I'm pretty sure it will be negative.

Her tiredness and trouble sleeping could be a combination of hormonal changes and maybe stress. The larger breasts may also be from hormonal changes.

Ask Your Own OB GYN Question
Customer reply replied 10 months ago
Ok well tomorrow will make like day 25 after sex. Will that be 100% accurate?
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 10 months ago

Yes, 100%.

Please click the rating stars. Thank you.

Ask Your Own OB GYN Question
Customer reply replied 10 months ago
Would she be having symptoms by now? Thank you for your help!!!
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 10 months ago

If she were pregnant, she may or may not be having symptoms now. But if she has symptoms, and her test is negative, you know the symptoms are not from pregnancy.

Ask Your Own OB GYN Question
Was this answer helpful?
Ask Dr. Norm S. Your Own Question
Dr. Norm S.
Dr. Norm S.
Dr. Norm S., Board Certified OB/GYN
Category: OB GYN
Satisfied Customers: 11,301
11,301 Satisfied Customers
Experience: Over 30 years of experience in OB/GYN practice, including teaching students. Fellow of American Board of Obstetrics and Gynecology.

Dr. Norm S. 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
My period is 5 days late (two negative pregnancy tests). I
My period is 5 days late (two negative pregnancy tests). I am 42 and have been having irregular periods for almost a year now. I went to the gynecologist in April and had hormonal testing etc. My leve… read more
Dr. Arun Phophalia
Dr. Arun Phophalia
Consultant Surgeon and Sports Medicine
Post-Doctoral Degree
33,716 satisfied customers
I had a tubal ligation done 2 weeks ago. The pregnancy test
I had a tubal ligation done 2 weeks ago. The pregnancy test that was performed right before the surgery was inconclusive. Doctor said if I am already pregnant, the baby won't be harmed. Today a blood … read more
Dr.M.D.Mazumdar
Dr.M.D.Mazumdar
Consultant Gynecologist
MBBS. MD (Obstetrics and Gynecology
3,699 satisfied customers
I just took a pregnancy test a few days ago and it came back
I just took a pregnancy test a few days ago and it came back positive. I'm bleeding now and having tiny pieces of tissue come out. I think I'm miscarrying. Should I just use a pad? No fever or pain. … read more
Dr.Saleem
Dr.Saleem
Consultant Cardiologist
Doctoral Degree
820 satisfied customers
I took 2 at home pregnancy tests both positive with faint
I took 2 at home pregnancy tests both positive with faint lines i have had on and off back pain only on my right side with brown spotting only when i wipe do you think it could be an ectopic pregnancy… read more
Dr Uzair
Dr Uzair
FCPS (R) General Surgery
M.B.,B.S. FCPS
3,806 satisfied customers
Today I had three pregnancy tests come back positive. Which
today I had three pregnancy tests come back positive. Which is very strange because I had a radical hysterectomy 3 years ago. … read more
Dr. J
Dr. J
Physician, Partner
Doctoral Degree
598 satisfied customers
My period is 8 days late, but i took a pregnancy test and it
hi! my period is 8 days late, but i took a pregnancy test and it says i'm not pregnant. this has never happened before. what should i do? … read more
Dr.Saleem
Dr.Saleem
Consultant Cardiologist
Doctoral Degree
820 satisfied customers
I'm three days late on my period but pregnancy test comes
I'm three days late on my period but pregnancy test comes out negative. Can I still be pregnant?… read more
Dr Anil Kumar
Dr Anil Kumar
M.B.B.S
2,751 satisfied customers
I had a pregnancy test done yesterday and is was negative
Hi I had a pregnancy test done yesterday and is was negative and I got the quantitive pregnancy test back today and it was 1.8 yet I am 4 days late of my period and I have a lot of pregnancy symptoms.… read more
Dr. Muneeb Ali
Dr. Muneeb Ali
Senior Registrar Critical Care Medicine
Doctoral Degree
8,221 satisfied customers
I took a urine pregnancy test it came out negative check the
I took a urine pregnancy test it came out negative check the test the next day in the morning there was a faded second line what does that mean… read more
Vakul Aren
Vakul Aren
Consultant Physician
Post graduation (Liverpool, U.K.)
4,124 satisfied customers
I took a urine pregnancy test it came out negative check the
I took a urine pregnancy test it came out negative check the test the next day in the morning there was a faded second line what does that mean… read more
Dr Uzair
Dr Uzair
FCPS (R) General Surgery
M.B.,B.S. FCPS
3,806 satisfied customers
Why does a Urine pregnancy test said negative but if then
Why does a Urine pregnancy test said negative but if then hours later you could see a second little line faithed… read more
Dr. Phil, MD
Dr. Phil, MD
Internal Medicine Physician
Doctoral Degree
2,776 satisfied customers
I took a urine pregnancy test it came out negative check the
I took a urine pregnancy test it came out negative check the test the next day in the morning there was a faded second line what does that mean… read more
Dr Uzair
Dr Uzair
FCPS (R) General Surgery
M.B.,B.S. FCPS
3,806 satisfied customers
How many times can you take a urine pregnancy test that
How many times can you take a urine pregnancy test that comes out negative for it to come out positive… read more
Medicaldoctor
Medicaldoctor
postgraduate resident,MD
Master\u0027s Degree
121 satisfied customers
I have taken home pregnancy tests and they are all negative.
I have taken home pregnancy tests and they are all negative. But my period is late.... what could be causing this? … read more
Dr. David
Dr. David
Radiation Oncology Attending Director
Post-Doctoral Degree
13,193 satisfied customers
Took a pregnancy test came back positive but I'm on depo
Took a pregnancy test came back positive but I'm on depo … read more
Dr.M.D.Mazumdar
Dr.M.D.Mazumdar
Consultant Gynecologist
MBBS. MD (Obstetrics and Gynecology
3,699 satisfied customers
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
3,699 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.
7,326 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
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