Internally freaking out

Let the record show that I know that it is impossible, but in the back of my mind there is a what if that is throwing me off and freaking me out beyond belief. Me and my boyfriend were grinding with clothes on and he came, I was on my period and with a tampon in as well. My periods have been super wacko since I’ve been on the patch, too. I’m probably bloated, and the stress and anxiety isn’t helping, but I can’t be pregnant, right? (I know this is a no brain question, but my nerves are killing me right now)