T minus 6 days and waiting

Mark 11:24 [Jesus said,] "Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." - New International Version of the Holy Bible

I am claiming Jesus' promise, therefore, I am 3 weeks pregnant!

Pregnancy dating usually goes by the woman's last menstrual period, because in non-ART pregnancies, the exact date of conception is not known. The gestation period for humans is actually 38 weeks, so assuming a 28 day cycle, going back to the beginning of the last cycle results in the common 40 weeks. And since there are 52 weeks in a year, that results in 3/4 of a year, or the common 9 months. Ta daa.

Here are a few articles about pregnancy dating.
Calculating Due Date after IVF
Pregnancy & Calculation of Length
Pregnancy - Facts to Know
Lunar months: Calculating your due date