'dating' a pregnancy

Do you count 40 weeks from your last period or from conception?

Re: 'dating' a pregnancy

The easiest way is to count back 3 months from the first day of your last period and add 7 days.

IE: 9/3 was my period...my due date is 6/10 (though the Dr says 6/6-6/8).

Re: 'dating' a pregnancy

thanks for that! ugh, I was afraid that was the case! I was counting 40 weeks from my estimated date of O not from my last period. Now we can't TTC until very end of Jan/early Feb