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March 29th, 2011, 07:37 PM
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kellyanne kellyanne is offline
Mega Super Mommy
Join Date: Dec 2005
Location: Washington
Posts: 1,960
A gestation is usually figured using the date of your last menstral period, which for most women is 2 weeks prior to their conception date. The sonogram will include those two extra weeks....so technically pregnancy is about 38 weeks...but we say 40 because of those weeks between LMP and conception. Hope that answers your question!
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