Dont judge me please.

Okay, so my boyfriend left me in August. And we got back together in December, I had sex with him and an other guy in the same week I became pregnant. I had sex with my boyfriend first than I cheated on him that weekend. Not to mention I was ovulating that weekend as well but I bought plan be. My conception date is December 22 thats the date I cheated on my boyfriend but had bought the plan b. It's ALWAYS WORKED I don't take it often either. So I'm so confused on whos the childs dad. I'm 13 weeks today I was hoping to get some help here. My obgyn wasn't much help for me but she's being supportive.