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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 Calculate Conception Date?

So my last period was between December 19th and 22nd of 2014 I m pregnant and supposed to be due September 28th which I ve been told I conceived between the 1st and the 5th of January. I had sex with my partner December 31st January 1st and the 3rd and 4th as well. Well this month on Tuesday August 18th I had an ultrasound saying I was 34 weeks and 2 days. What day did I conceive? And is my due date wrong?
posted on Thu, 3 Sep 2015
Twitter Sat, 26 Sep 2015 Answered on
Twitter Mon, 28 Sep 2015 Last reviewed on
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Dentist,  's  Response
Hi Welcome to HEALTHCARE MAGIC..

I have gone through your query and can understand your concern.
Date of conceiving is normally 14 days after last menstrual period. However it can be just a week after last menstrual period. That's whats happened with you
If u conceived on 1 January, your fetal age should be 230 days which is 33 weeks. So your conceiving date is 25-27 december according to your ultrasound.
Also your due date would be 7-10 days earlier than mentioned to you.

Don't worry
Hope this information helps
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How To Calculate Conception Date?

Hi Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concern. Date of conceiving is normally 14 days after last menstrual period. However it can be just a week after last menstrual period. That s whats happened with you If u conceived on 1 January, your fetal age should be 230 days which is 33 weeks. So your conceiving date is 25-27 december according to your ultrasound. Also your due date would be 7-10 days earlier than mentioned to you. Don t worry Hope this information helps