I had sex with my ex January 31,2012 and then I had sex with him again February8,2012. Then I had sex with my friend February 10,2012. My due date was October 27 2012 so which one them is my baby father?

Yep...it could be either one. You will need a DNA test to be sure.

You need a DNA test done that requires a sample from both.

If you have had multiple partners during a single cycle than any one of them can be the father. There could be enough irregularities with your cycle, i.e. when you ovulate and how long the sperm stay in a warm inviting place like your uterus, that either could be the father. So as was said you will need to get a DNA test.

I'm with everyone else... Tell both guys now (put it off and you will be sure to make them both hostile, nobody likes being lied to), and you will have to have a DNA test done after the birth to find out who the lucky man is.