I am in my second trimester and due jan 30,2014. ON may the 2nd 2013 I had unprotected sex with an ex. He did ejaculate inside me. On the 4th and the 7th I had unprotected sex with my boyfriend but he did not ejaculate inside of me. If my last period was 4-24-13. And the doctor says I conceived on may 8th who is the likely father?

Calculating conception dates is an inexact science. It could be either.

You will have to wait until after birth and have a DNA test done to determine paternity.