Help me

Okay so yesterday I had quick sex with my 2 year long boyfriend. When I say quick I mean it I just got on top did a little he picked me up and we stopped because we didn't want to get caught. He didn't cum inside me neither of us finished, I'm on birth control pills for about 2 months now and it was unprotected. My legs are sore I think maybe because I was riding him and this was something I've never done so my body wasn't use to this. Also a few days ago I did exercise which I never do which led to me being sore in my shoulders and around my boobs I'm still sore today. So i don't know could there be like a slight chance that I'm pregnant?