usually what they do is they add on 9 months and 7 days from the date of your last period which working it back would take that to February 11th,you are usually fertile around the 9 10 11 12 days after your period,so that would make it around the 18th to 22 feb.
Count back nine months from your due date.
March
The approximate date of conception was July 7th.
march 21
go to babycenter.com and use the due date calculator
The approximate date of conception was May 2nd
Roughly March 6th
in march
April
may 16th
6th June
July 17,2008