Can Mirena Coil Cause Urinary Infection And Brown Vaginal Discharge?

Hi I have mirena coil for five years now, due to be changed Feb '11. Last weekend I had UTI symptons, tried to treat with over counter remedy. By Monday was still in discomfort, went to GP urine tested, had bacteria in urine, prescribed trimethropin. My concerns are that I don't have periods with the coil, just brown discharge and a jelly like substance. At the same time as infection I had some blood loss and the jelly like substance was very mucky brown. I started tablets Monday and now wednesday and still have pain around groin, above pubic bone and back ache. Do you think this infection has anything to do with the coil? I have had UTI before, but never felt like this for so long. Thanks