how many weeks pregnant will i be
A pregnancy due date is actually calculated as 40 weeks from the first day of the last menstrual period. If you are counting âlunar monthsâ which are only 28 days like a period cycle, then it is 10 âlunar months.â If you count full calendar months that are 30 to 31 days long, then it is really only 9 months.he doctor will estimate a due date by adding 40 weeks or 280 days to the first day of your last menstrual period. Remember, this is only an estimated date and only a small percentage of babies are actually born on the exact date.