Pregnant?

Ok so this just happened. Literally just happened 20 minutes ago. My boyfriend just left. We were having sex and he was about to cum. He had a condom on and everything. But it slipped off right as he came. I was riding him when it happened. I went up though when he came. Like I wasn’t all the way down on him. I got up.

I got up, ran to the bathroom, peed, and tried to make sure it didn’t get in there. Again, we were wearing a condom, but it slipped off at the end when I just got off him when he came. He was kind of still in me but not really. Idk if that makes sense. I just started birth control as well. Literally 3 days ago. What should I do? We’re both freaking out. Please give comments. (Also I’m my period with a low fertile window right now)