Google is a terrible place

Okay so I’ve never really been sexually actively but I’m starting to be. I’m on the pill but I know it’s not 100% anyways. I’m terrified to get pregnant so I don’t really want to have sex but I do want to have sex with my boyfriend. Well we decided that we really wanted to try something so we tried anal. AWFUL IDEA. So now I’m freaking out becuase I googled and it says sperm can swim from the outside of the vagina into you body and get you pregnant. I hated it so much that we only tried for like three minutes and there was probably precum. I mean he was definitely more near my anus but that’s still pretty close to my vagina and it was dark, so it could have touched my vagina. So now I’m freaking out that there was sperm in his precum and it swam inside of me. We did shower before and he peed so maybe there wasn’t any sperm but I don’t know. I just am freaking out cus I really don’t want to be pregnant