Help!! Need advice.

Okay, so my bf and I have had sex the past three nights in a row, and after the 3rd night, I got up to pee and I keep feeling like I have some pressure down there while/after peeing and I don't know what's going on! I keep having to go to the bathroom just to pee and it's really frustrating. I take BC, and I've already taken two pregnancy tests from different brands that were both negative. What is up?? Could I have a UTI, or what? 🙃🙃