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Dr. Andrew Rynne
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Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Is The Exact Date Of Pregnancy Calculated?

Hello. My last period was February 13, 2010. I have a 7 day period. I think its a 28 day cycle. I had sex on February 26, 2010 and again on March 7, 2010. My due date according to my doctor is November 28. My question is did I get pregnant in February on the 26 or March 7th. At first I mistakenly told my doctor that my last period was on February 18th instead of the 13th but even when I gave him the correct date he still said my due date was on Nov. 28th. My first ultrasound on April 12th said I was 8wks and 1 day but according to him I was 7 wks because of the measurements of the baby. Can you please predict when I got pregnant?

Wed, 6 Jan 2016
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OBGYN,  's  Response
Hallow Dear,

With 28 days periodicity of your cycle, the day of egg release (ovulation) falls near February 26 (February 27 to be precise) when your menses appeared on February 13. The chances of conception are more likely to be due to the intercourse on February 26 rather than that on March 07.

There are various ways of calculating the Expected Due Date (EDD).
1. 9 months + 7 days from last menstrual period (LMP) : as per this formula, your EDD should be November 20.
2. Ultrasonography decides the age of the pregnancy as per the size of the baby and then predicts the EDD.

So as per the calculations of your LMP, your EDD is November 20.

I hope this helps you.

Dr. Nishikant Shrotri
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How Is The Exact Date Of Pregnancy Calculated?

Hallow Dear, With 28 days periodicity of your cycle, the day of egg release (ovulation) falls near February 26 (February 27 to be precise) when your menses appeared on February 13. The chances of conception are more likely to be due to the intercourse on February 26 rather than that on March 07. There are various ways of calculating the Expected Due Date (EDD). 1. 9 months + 7 days from last menstrual period (LMP) : as per this formula, your EDD should be November 20. 2. Ultrasonography decides the age of the pregnancy as per the size of the baby and then predicts the EDD. So as per the calculations of your LMP, your EDD is November 20. I hope this helps you. Dr. Nishikant Shrotri