If I Had sex with 2 different guys and I think I'm pregnant, I didn't had my period on Nov. The last time I had sex with the first was on Oct 31st, and with the other on Nov 26. Who most likely could be the baby's father?

Before you start really doing the guessing game have you taken a pregnancy test of any type yet? If you haven't then do that first, then if you are check with doctor on how far he suspects you are. Bottom line is that if you are pregnant you will need to have a test done when your child is born to determine whom the father is. If you are NOT pregnant, then I would take this get out of jail free card and learn to use some contraceptives, especially when you are not going to be with same partner, safe sex is a no-brainer. You never know whom or how many partners the person you are sleeping with have been, and what type of disease they have, etc.

Your right thank you.