Urine on clothes

As Salam alaikum. Unfortunately, I suffer from prostatitis. And sometimes there are feelings as if urine has dripped, sometimes it happens that it's just an instigation, and it happens that it has dripped. And when I was in the toilet today, I was washing myself and this feeling happened. It was like urine dripped, but I do not know if it really dripped, and if it dripped, where exactly on clothes. Absolutely no idea. What to do?