UTI? SOAP? GOOD SEX?

Had sex with the same person I had sex with 2 weeks ago. Was burning when I peed the next day but it was more so outside of my vagina but it was rough sex that we had and then yesterday I had sex with that person and it was the same thing but instead of bruins around the vagina, it was inside burning for like 2 seconds. But I took a shower before we had sex. Maybe it’s the soap?? I got checked out a few weeks ago and it was chlamydia, it was treated. This person isn’t my partner but we had sex occasionally. So what do you think? Maybe the soap? Another UTI? Maybe it’s because of a hour of rough good sex? Any rude comments will get you blocked. I’m here to ask for help, not to be bashed and don’t tell me something I already know.