go to doctor asap. usually bladder infection, does it hurt to pee? Do you have to pee more than usual, or does it feel like you have to but not much or nothing comes out?
it can get into your kidneys if thats what it is, and you will get very sick if it does.
Are you on any kind of medication?
Could mean a lot of different things. It's called hemeturia, and I would nip it in the bud, if you have had it before, by going to a urologist. I had that on and off, wasted a lot of money and time, trying to find out why I kept having it, and they all just prescribed antibiotics. Finally went, had a test where they went in with a camera, and they discovered what was causing the bleeding. Should have gone to a Urologist to begin with! Good luck! di216