I am 24 have recurrent uti for last 6 months. I have done culture test for 2 times first time the bacteria was present but second time nothing is presented. I have done 3 course of antibiotics and I have done usg abdomen scan that report is normal but now I have take (fosfomycin powder) for last two weeks my doctor prescribed for continuous 4 weeks but now I have seen one or two small black dots in my urine. I really worried I don't know what's happen in my body. I really fell its sign bladder cancer on the other side I have encourage myself its come only for using this power but one for last 6 months I have never scene this black spot in my urine just two weeks only I have scene it for sometime but I don't know what's the exact reason plss tell my I don't have cancer please.