A member asked:

So found out i was pregnant and i should be 4 weeks but er say 3 how is this?

A doctor has provided 1 answer
Dr. Seth Derman answered

Specializes in Reproductive Endocrinology and Infertility

Last period: The dates that are used to calculate your due date are based on the first day of your last period, not on when you conceive. That is why most women are further along than they think.

Answered 9/23/2013

4.9k views

Thank

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