Likelihood of pregnancy?

Hi, I recently had sex with my boyfriend. I love him and am sexually attracted to him, but I have a lot of anxiety around pregnancy. I was on my period (second to last day), we used a condom that didn’t break (although when I got off of him it almost slipped off), and I’m on the birth control pill. I have severe anxiety around getting pregnant as I am too young to support a child. Do you think I could get pregnant?