| Nope, gestational age is considered as beginning from day 1 of LMP.  But because my body refuses to operate on anything resembling a schedule, that's not a very accurate measurement.  Fertilization technically occurs at the beginning of week 3.  So IF I was a normal woman, the age the u/s came up with would mean that my LMP began on March 21, when it was actually the 15th, hence the 1 week off on the original estimate. 
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