I've had a lot of urinary tract infections (when I was on ortho tri cyclen) and you do not appear to have one. I've also read about them and brown/red and pink discharge is not a sign of it. If you did have an uti you would have to pee all the time but not be able to, and when you did it would hurt a lot (and your pee would be really dark yellow or orange and cloudy or bloody). Your discharge might be caused by using depo-provera, and honestly I wouldn't recommended using that as birth control because so many women have serious problems with it and actually want to get it banned. But it if works for you that's fine. I would talk to your doctor about your problem. You could also have a vaginal infection or maybe a sti. Do you use condoms or do you and your partner get checked regularly? You have to get check out at least two times 6 months apart (since it can take a while for things to show up) before you stop using condoms and then every year after that. But I know know your age and the status of your relationship. Most of the time I would say always use condoms unless you are mature enough and are in an extremely serious and trusting relationship.