Repost: will I be okay?

I’m reposting because I put in a wrong word which messed up everything.

My bf and I are not trying but we wouldn’t mind. Today we had unprotected sex and he came in me. We bought an emergency contraceptive (take action) right after & some 20 minutes later, I went to the rr & his semen slid down out of my vagina. Am I still protected by the pill? I know there’s still a chance but how big ?