New to Sex

Growing up I never really got the proper Sex Ed class. And now that I’m trying things I’m always overthinking. Let’s say I had a tampon in but the tampon wasn’t “fully” open inside of me. I basically had sex with a tampon in. The thing is that I’m on my “ovulation days” and when I had taken my tampon out after intercourse it was super slimy. I felt his tip inside of me, but I’m really scared because he was a bit wet down there. After, I peed and it burned. Is this normal? Should I take a plan b?