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I know the due date - what is the date of conception ?

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my girlfriends pregnacy due date is nov 13 2007 what can i say the conception date was?

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replied October 19th, 2007
Baby Q and A, Baby Health Answer A3312
The day a woman conceives is very close to the day she ovulates. In fact, the difference between conception and ovulation is only several hours we can technically say that the ovulation day is the same as the conception day. Ovulation occurs 14 days before the next menstrual period comes. So, to determine ovulation/conception day we need the date of the first day of the last menstruation and the usual, average cycle duration. Last menstruation date (LMD) can be calculated according to the due date (DD) and this formula:

LMD = DD + 3 months – 7 days
LMD = Nov.13 + 3months – 7 days = Feb.6, 2007

You didn’t tell me your girlfriend’s cycle duration so I can't tell you the precise date of conception. If we suppose that her cycle lasts about 28 days (as in most women) we can suppose that conception happened somewhere in the second half of February 2007.

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