My cycle came march 4, 2012 my cycle last 6 days I had sex with my ex on the 6th day of my cycle wile discharging. I had sex with my boyfriend that next week on the 16 & 17.. who's the daddy

There is NO way to conclusively determine paternity until the child is born and a paternity test done. It could be either of them given the time frame.

P.S. For future reference please be more careful when selecting a topic to post to. This was originally posted under the Cycling forum which is for questions about bicycling, not menstrual cycling.