When I get my period and I have to pee, it has a sting to it. It can't be a urinary tract infection simply because it is only present when I have my period. A day or so before I stop bleeding, the sting goes away. Is this because of something I'm eating/drinking? Should I consume more juice or water during my period? I've noticed that when I drink cranberry juice, or cranapple (Cranberry and Apple Juice mixed) it lessens the sting. Could this have to do with me being on the pill, or is it just simply something I'm doing wrong as far as dietary needs?

Also, I thought to include that I am a virgin in all aspects of anything sexual (and this makes myself and my mom proud. :D)