How the pregnancy is calculated
The number of weeks that you are pregnant is determined from the first day of your last period. Conception is predicted to occur in week 2 when women are most fertile, and the baby is due to arrive in 40 weeks (although often this is not the case). The easiest way to calculate the estimated due date is to substract three months from the first day of your last period, then add seven days. For example, the first day of my last period was July 26. Minus three months it’s April 26, and plus 7 days it’s 2 May. Read the rest of this entry