Am I infertile?

I know only a doctor can answer that

But I had unprotected sex with my bf 2 weeks ago. He ejaculated in me and we didn't bother use Plan B.

Now my AF just came. Am I infertile or is it just a coincidence ??

Is this normal? All my life I've been told that if a guy ejaculated inside of you then that's it. You're pregnant.