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A member asked:

I had sex the 10th , 12 , 20th of dec. my first us was jan16th=6 weeks 1 day . i had a 2nd us jan 31st at 8weeks 2 days . my conception for both based off an online calculator says dec 19 . could the 10th be the day that got me pregnant?

A doctor has provided 1 answer

Assuming that the normal fertile period is within 6 days of ovulation, and since the ultrasound dates have an error of plus/minus two or three days, the 10th is an outside possibility. The 12th is more likely and the 20th is most likely.

Answered 5/31/2023

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