My lmp was July 4,2012... I had sex with Guy #1 July 16,2012... ovulated July 18,2012... I had sex with Guy #2 July 20,2012... my due date is April 10,2013 I'm having a little boy

There is no way to tell. You'll have to wait until after the baby is born and have a DNA test performed.

Calculating conception dates is an inexact science. There is no way to tell which one until you give birth and have a paternity test done.

I agree with the answer about having a DNA test performed, but you will have to wait until after the baby is born. Good luck, and I wish you the best in everything.