Subtract 2 weeks: Conception time is estimated as 2 weeks after the "start of the pregnancy" when doctors are counting the weeks. So, 12 weeks and 5 days pregnant... means a woman is now 10 weeks and 5 days after conception. Using a calendar, just count backwards from today, until reaching that day about 10 weeks and 5 days ago. All dates are only estimates.
Answered 9/17/2014
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