A typical pregnancy lasts, on average, 280 days, or 40
weeks - starting with the first day of your last normal
menstrual period (LMP) as day 1. An estimated due date
(EDD) can be calculated by following steps 1 through 3:
1. |
First, determine the first day of your last menstrual
period. If you do not know the exact date, calculate
as close as possible. |
2. |
Next,
count back three calendar months from that date. |
3. |
Lastly,
add one year and seven days to that date. |
|