This may sound crazy but I really need help. I had sex with my boyfriend sometime between April 1-5. I had ran into my Ex and had sex with him sometime in March.. maybe around the 11th. My due date has been set to Dec. 25. I am just trying to figure out if there is an exact way to figure out which guy I got pregnant by. I also don't remember my LMP so Its been confusing for me. Can anyone help?