HELP!!!

Ok so I've been on the cerelle pill for about 3 and a half months now and my last period was awfully weird, it came and went and then stayed. But after that I started to get a brown discharge and an unusual smelling urine. I thought it could have been a UTI but I am sexually active and I can't use condoms as they are soooo uncomfortable for me😫

I've done a pregnancy test and it came back negative but because my period came for a day and it was light and then finished and now I'm back to the brown discharge, I'm so confused 😫x