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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.

See http://www.vaughns-1-pagers.com/Biology/gestation-periods.htm.

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.

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โˆ™ 2008-01-05 02:32:47
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Q: When did you conceive if your due date is February 13?
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May 9-13


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The approximate date of conception was September 13 2005.


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well my due date was Jan 3rd and i conceived on April 12th so you must have conceived on April 22.


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last period was February 13 and the due date is November 8 when he or she conceived?


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If your last menstrual period was May 13, your ovulation should have been approximately between May 26 and May 28, which is when you likely would have conceived.


When did you conceive if you had your baby on May 13 2010?

It depends on whether May 13th was your due date or not. If it was your due date, this makes your estimated date of conception August 19th 2009. However, this date is give or take a few days. It should not be used to determine paternity either.


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When did you conceive if your due date is May 13?

May 13th 2010? Your conception date is roughly between Saturday August 15th 2009 and Friday August 21st 2009, give or take a few days


What is the ovulation date if the baby is due November 13 2010?

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If your due date feb 13 2010 when did you conceive?

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Sometime in September.


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