If your due date is on May the 8th 2009 then going back 40 weeks will take you to July 31/August 1st. 2008. This should be the approximate time you began your last period, so you would have ovulated or produced an egg 14 days after the first day of that period. Therefore, conception should have taken place sometime between 14th and the 28th August. {get your diary out].
Roughly August 16th
march 21
may 16th
The approximate date of conception was May 2nd
The approximate date of conception was May 25th
April to early may.
29th may
May 23rd to 31st.
The approximate date of conception is May 20th
The approximate date of conception was May 31st
The approximate date of conception was August 25th
The approximate date of conception was August 28th