Possible UTI?

On Wednesday I had sex and it sort of hurt like it was too dry. Then Thursday I had sex twice and it progressively hurt worse to have sex. When I went to wipe there was brownish discharge that almost looked like feces, not blood. I have no idea how I would get feces on the inside of my vagina when I wipe front to back always. Anyway, the next day I wore a lite tampon to see if I saw the discharge again - this time it was a light lime greenish color and a weird smell. It started kind of burning to pee. I started OTC UTI meds Friday night bc it was really burning after I peed. It doesn't really feel like I have to pee all the time, just burns right after I go. The burning hasn't gone away and I'm wondering if this could be a yeast infection instead of a UTI, although I've had a yeast infection before and it never burned to pee.