I had unprotected sex with my boyfriend Nov 29th, 30th as well as the morning of Dec 1st; he always finishes inside of me. We got into a huge argument and I ended up sleeping with my ex Dec 2 at about 2 in the morning which was unprotected and he also finished inside of me. I then had sex with my boyfriend again on Dec 3rd. Yes I am ashamed of myself. However, my Dr says my LMP (according to the gestational ultrasound measurement) was Nov 16. My conception date is between Nov 30th-Dec 4th. Which guy am I most likely pregnant by? Please help as best you can.