May 21 of the prior year would be the approximate date, plus or minus a couple of days or so, as the issue is rarely so well determinable from such an uncertain time as a projected due date, because it is not clear how your due date was determined, and how accurate it is.
Nine months less 8 days from conception to delivery is typical (266 days). Thus counting backward nine months from February 13 gives May 13 of the prior year, less 8 days makes the date of conception about May 21 of the prior year, but it could be a couple of days either side of that in actuality.
One can also calculate 280 days, or 40 weeks, from the first day of the woman's last menstrual period. See http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Baby_due_date?OpenDocument
but this does not give you the date of conception, it only relates the due date to the first day of your last menstual period. As this website noted, only 4% of births actually occur on the date predicted.
additional to the question it just doesn't make sense to me,my last period was february 14th i usually have a 30-35 day cycle but according to all these websites i ovulated way before i would have sex and to my knowledge an egg only lives for upto 24 hrs after its realeased so how am i pregnant? according to my due date my last period should have been the 26th of february which that's a negative i had it on feb 14th. so i guess my question is did i get pregnant on the 11th a couple days before my next period or on the 6th?
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