This may sound crazy but I really need help. I had sex with my boyfriend sometime between THE END OF JULY AND AFTER AUG.7. I had ran into my Ex and had sex with him AUG.16,2010. My due date has been set to MAY 10,2011. I am just trying to figure out if there is an exact way to figure out which guy I got pregnant by. MY LMP WAS 8.3.10 so Its been confusing for me. Can anyone help?

You can guess at it from estimated due dates, but to be honest, due dates are just that estimates from info you give and provide and then from size of baby in a ultrasound at times.

There is no way to be sure till the baby is born and you do a DNA test ( merely going by looks does not work)