A member asked:

My last period was january 26, i had sex the 29th and the 31. i took a pregnancy test today and it said positive the advice nurse over the phone said i was 4 weeks but couldnt tell me which date i most likely got pregnant?

A doctor has provided 1 answer

Pregancy date ?'s: Since sperm may live for several days, and ovulation is not documented in the records, either the "29th or 31st" could result in pregnancy. Ascertaining genetic source of the sperm would take comparison of the DNA in the fetus with the DNA of the father.

Answered 2/25/2021

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