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Dr. Andrew Rynne
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Dr. Andrew Rynne

Family Physician

Exp 50 years

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How To Find Out Date Of Conception?

Hi,i m confused my periods came on 11th July 2010,i had unprotected sex on the 18th July and on 24th July a condom was used but broke so i took Postinor 2 and started bleeding on the 25th-27th July. I again had sex on 1st August and i m now pregnant but not sure when it happened. Please help. Did an ultrasound on 22nd September 2010 and my due date was 1st May 2011 but i also told the doctor that my LMP was 25th July because thats the last time i saw blood.
Wed, 9 Dec 2015
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OBGYN,  's  Response
Hallow Dear,

You had taken Postinor 2 after the intercourses on 18th and 24th of July. So the chances of pregnancy resulting from sex on those days is very minimal. It is due to the Postinor pills, you got additional bleeding on 27 July.

Considering your due date as 1 May, the LMP would be around 24 July. You say, it was 25 July, which also fits into this calculation. In that case your date of conception has to be somewhere near 8 August. However, a week to and fro is possible.

The Ultrasonography calculations are based on the size of the baby and not on the LMP; hence there may be variation of about a week or so.

I hope this clarifies your dilemma.

Dr. Nishikant Shrotri
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How To Find Out Date Of Conception?

Hallow Dear, You had taken Postinor 2 after the intercourses on 18th and 24th of July. So the chances of pregnancy resulting from sex on those days is very minimal. It is due to the Postinor pills, you got additional bleeding on 27 July. Considering your due date as 1 May, the LMP would be around 24 July. You say, it was 25 July, which also fits into this calculation. In that case your date of conception has to be somewhere near 8 August. However, a week to and fro is possible. The Ultrasonography calculations are based on the size of the baby and not on the LMP; hence there may be variation of about a week or so. I hope this clarifies your dilemma. Dr. Nishikant Shrotri