Posted: Fri Jan 11, 2013 5:55 pm
To calculate your due date you need to know the date of your last period. (the first day it started)
Then you add on 6 days.
Then add 9 months.
So if the first day of your last period was 13th Dec. You would be due 19th Sept.
To work out how may weeks you are just count from the first day of your last period to today. Agin say your period was 13th Dec you would be 4 weeks.