OB GYN

OB-GYN questions? Ask a gynecologist online.

Ask a Doctor,
Get an Answer ASAP!

Just kind of a personal question. On September 20th, a girl…

Customer Question
Just kind of a...

Just kind of a personal question. On September 20th, a girl had an ultrasound that read 5weeks and 6 days pregnant.. that would make date of conception around August 10th, correct? If the man I know in fact did not sleep with her for the first time until the last week of August, what are the chances of that baby being his?

Doctor's Assistant: Have you been keeping a personal medical record?

This isn't even my record.. this is just in regards ***** ***** I know and care about.. how accurate is that early ultrasound?

Submitted: 8 months ago.Category: OB GYN
Show More
Show Less
Ask Your Own OB GYN Question
Answered in 17 minutes by:
9/25/2017
OB GYN Doctor: Dr. D. Love, Doctor replied 8 months ago
Dr. D. Love
Dr. D. Love, Doctor
Category: OB GYN
Satisfied Customers: 19,550
Experience: Family Physician for 10 years; Hospital Medical Director for 10 years.
Verified

Hello from JustAnswer. This is Dr. Love.

No, that is not correct. Gestational age is expressed as the number of weeks since the first day of the last menstrual period. This is a carry over from long ago when the date of the last period was the primary information that could be used to determine the gestational age. As our understanding of physiology has improved and technology has developed, the gestational dating system still is based on the last menstrual period. So, this ultrasound indicates that the pregnancy is the age consistent with a last period on 8/10/2017.

The day of ovulation occurs 14 days later. So, by this ultrasound, the day of ovulation would be around 8/24/2017.

As for accuracy, an early ultrasound is very accurate, but it is not perfect. An early ultrasound can be off by as much as 5 days. So, the correct interpretation of this ultrasound is that the day of ovulation would most likely be 8/24/2017, but it could be anywhere from 8/19/2017 to 8/29/2017.

So, if a man had sex with her the last week of August, then he could be the father. The chances that he is the father is also related to the number of other sexual partners during the last half of August. Since sperm can survive in the female genital tract for up to 5 days and conception would happen within about 12 hours of ovulation, the day of sex that yielded this pregnancy could have been as early as 8/14/2017 or as late as 8/30/2017. If this man is the only man with whom she had sex during this interval, then the chance that he is the father is 100%. But if there are other men with whom she had sex during this interval, the chance would be less.

If I can provide any additional information, please let me know.

Ask Your Own OB GYN Question
OB GYN Doctor: Dr. D. Love, Doctor replied 8 months ago

Please let me know if I can provide any further assistance.

Ask Your Own OB GYN Question
Was this answer helpful?
Ask Dr. D. Love Your Own Question
Dr. D. Love
Dr. D. Love
Dr. D. Love, Doctor
Category: OB GYN
Satisfied Customers: 19,550
19,550 Satisfied Customers
Experience: Family Physician for 10 years; Hospital Medical Director for 10 years.

Dr. D. Love 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
I have questions about dating scans conception date, Like 3
I have questions about dating scans conception date … read more
Dr. David
Dr. David
Radiation Oncology Attending Director
Post-Doctoral Degree
13,193 satisfied customers
I have questions about dating scans conception date. Like 3
second opinion] I have questions about dating scans conception date … read more
Dr. J
Dr. J
Physician, Partner
Doctoral Degree
598 satisfied customers
I have a question regarding risk of pregnancy. I just
I have a question regarding risk of pregnancy. I just finished my menstraul cycle yesterday and had unprotected sex with my fiancé today. He accidentally finished inside me and I am wondering what the likelihood of getting pregnant would be. … read more
Medicaldoctor
Medicaldoctor
postgraduate resident,MD
Master\u0027s Degree
121 satisfied customers
I had unprotected sex and i think its my ovulation period.
I had unprotected sex and i think its my ovulation period. Can i start with diane35 as per normal one pill untol … read more
Dr. Ravoof
Dr. Ravoof
Doctoral Degree
2,010 satisfied customers
I had sex on my ovulation day ... Fairly decent to my
Hi JA: Hello. How can I help? Customer: Ok I had sex on my ovulation day ... JA: Is this your first time reaching out for information about this? In general, how would you describe your overall health… read more
Dr. David
Dr. David
Radiation Oncology Attending Director
Post-Doctoral Degree
13,193 satisfied customers
I have taken fertility steriods and at ovulation there were
Hi, I have taken fertility steriods and at ovulation there were 5 eggs observe through ultrasound. My doctor gave me a hcg shot and that was day 13 if my cycle. I recently started noticing that I have… read more
Dr.M.D.Mazumdar
Dr.M.D.Mazumdar
Consultant Gynecologist
MBBS. MD (Obstetrics and Gynecology
3,699 satisfied customers
My ovulation was around March12-14 and we have been trying
Hi, my ovulation was around March12-14 and we have been trying to conceive. I saw some pink spotting on March 25. On March 26th and 27th I saw some brown spotting. On March 28th I didn't see any spott… read more
Dr. J
Dr. J
Physician, Partner
Doctoral Degree
598 satisfied customers
How does it take for a pregnancy blood test to come back?
How long does it take for a pregnancy blood test to come back? And if there is a possibility of false results both negative or positive? I did the urine test sticks and all came back negative. My peri… read more
Dr.M.D.Mazumdar
Dr.M.D.Mazumdar
Consultant Gynecologist
MBBS. MD (Obstetrics and Gynecology
3,699 satisfied customers
I got an ultrasound done by a pregnancy center and my dates
I got an ultrasound done by a pregnancy center and my dates measured two weeks behind where I thought I should be. I measured 6 weeks and 2 days and thought I should be about 8 weeks and 3 days. I am … read more
Dr Stan
Dr Stan
DO
3,183 satisfied customers
How many days after conception can u see gestation sac on
How many days after conception can u see gestation sac on tvu, and how accurate is Crl measurement in 6 w 2 d?… read more
Dr.M.D.Mazumdar
Dr.M.D.Mazumdar
Consultant Gynecologist
MBBS. MD (Obstetrics and Gynecology
3,699 satisfied customers
I wanted to ask a few questions about my conception date. I
Hello. I wanted to ask a few questions about my conception date. I am now supposedly 8 weeks and 6 days pregnant because I was positive I had my last period on Dec 1, 2017. I had unprotected sex that … read more
Dr SS
Dr SS
Doctoral Degree
12,327 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.
7,307 satisfied customers
I am 7 weeks and 5 days pregnant today. My conception date
my conception date was October 21st 2017. Is it possible to have gotten pregnant from sexual intercourse on October 10, 2017?… read more
Doctor John MD
Doctor John MD
Urgent Care and Sports Medicine Doctor
Doctoral Degree
771 satisfied customers
Can a cyst affect conception / pregnancy if it ruptures? My
Can a cyst affect conception / pregnancy if it ruptures? My husband and I are trying to concieve and a day after intercourse I started to release this blood and brown tinged fluid could it be coming f… read more
Dr. J
Dr. J
Physician, Partner
Doctoral Degree
598 satisfied customers
Can ultrasounds really determine conception dates? I have a
Can ultrasounds really determine conception dates? I have a tilted uterus could affect an ultra sound visual early pregnancy?… read more
Dr Uzair
Dr Uzair
FCPS (R) General Surgery
M.B.,B.S. FCPS
3,806 satisfied customers
If a patient is ovulating and ovary age/bloodwork and
Hi if a patient is ovulating and ovary age/bloodwork and everything looks great, why would an ob/gyn recommend femara? The patient is taking vivance during this trying to get pregnant stage. I get it … read more
Dr. J
Dr. J
Physician, Partner
Doctoral Degree
598 satisfied customers
Ovulation kit I was taking ovulation test and shows I
Ovulation kit I was taking ovulation test and shows I ovulated around 9th-12th. I didn't have a previous period. Could they have picked up I was pregnant or would they work similar to a pregnancy test… read more
Dr Ted Manos
Dr Ted Manos
Self Employed
MD
925 satisfied customers
How accurately can a doctor predict the conception date
How accurately can a doctor predict the conception date within the first four weeks, before an ultrasound? … read more
Dr Uzair
Dr Uzair
FCPS (R) General Surgery
M.B.,B.S. FCPS
3,806 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