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How Accurate Is The Date Of Conception Calculation Based On

Posted on Sun, 30 Aug 2020

Question: How accurate is the date of conception calculation based on an Ultrasound? I had sex with a girl on XXXXXXX 13th, and she had sex with her ex-boyfriend on XXXXXXX 7th. The doctor told that she is 10 weeks pregnant and the date of conception was on XXXXXXX 6th. Is it still possible it could be my child?

Follow up: Dr. Richa Agarwal (3 minutes later)

Ultrasound was done August 7th

Answered by Dr. Richa Agarwal (44 minutes later)

Brief Answer:
In early weeks of pregnancy ultrasound is accurate.

Detailed Answer:
Hello dear,
Thanks for trusting us about your healthcare.
I have gone through your history and understand your concern.
If ultrasound is done in early weeks of pregnancy,it is more accurate to diagnose conception date,due date and foetal weeks ( up to 10-12 weeks)
difference of only 2-3 days is there.
Please tell me her last period date ( LMP)?
Both have you done unprotected sex?
Hope to hear from you soon,
Good luck
Regards

Above answer was peer-reviewed by : Dr. Raju A.T

Follow up: Dr. Richa Agarwal (21 hours later)

Hello Dr,

So if the margin of error is 2-3 then it can't be mine?
I don't know her LMP but yes we did have unprotected sex.
She told me she was on birth control which didn't work because she got pregnant.

Warm regards,

Answered by Dr. Richa Agarwal (2 hours later)

Brief Answer:
Yes,in early pregnancy it is very accurate.

Detailed Answer:
Hello dear,
Thanks for the information.
In early weeks of pregnancy, ultrasound is very accurate in diagnosing exact weeks of pregnancy and margin of error only 2-3 days.
For confirm paternity you can go for paternity test as well.
It can be done in your case,so it will confirm who is the father of the child.
Hope found useful.
Good luck
Regards

Above answer was peer-reviewed by : Dr. Raju A.T