Who’s the father

I already know how bad it sounds, and I’m such a “slut” for it but shit happens. I’m pregnant and I’m not sure who the father is. I had a FWB and he would pull out. Then 10/17 I met this guy at the bar and we hooked up. We are still seeing each other. He would pull out too, I was on birth control this entire time. Last time I seen my FWB was the week before I met the new guy. I knew something was wrong when I didn’t have my period last week. I haven’t said anything to anyone and I’m scared about all this. What do I do?