My Baby Due Date Is The 8th May 2009 Can You Tell Me What Date My Baby Was Conceived On?

This is usually figured out by the first date of your last period.  

So if Today is the first day of your last period, your due date would be 12/31/2009.

I know I'm a guy and answering this question is weird - but I am a father of 3 and very involved with my kids even during my now ex-wifes pregnancy.