ugh😔

I always find somthing to worry about... this has happened to me so many times ever since my first pregnancy scare... I was with my bf yesterday and I gave him. BJ I wiped my mouth with my hand  and went to the bathroom like 30 minutes later after I wiped I started to think of "what ifs" like what if there was some cum under my fingernail or in my hand and got in my vag when I wiped. And we were dry humping there was a lot of layers b/w us leggings under and jeans and on him sweatpants and boxers it's so unlikely but I still can't seem to forget about it I always find somthing to worry about. Idk what to do I can't stop worrying it's consuming me😭😢I'm only 17 I don't want to live like this idk what to do