When I have sex with my boyfriend, it's unprotected and he finishes inside of me. I always pee afterward to prevent UTIs. However, sometimes that after-sex pee hurts/burns and/or very little urine comes out. However, subsequent pees are fine and do not hurt or burn in any way.
Has this happened to anyone else? We've both been tested for STIs and are in a monogamous relationship. It's not a huge issue; it's just... a little annoying.