Hi. I m starting my second round of mitomycin treatment for bladder cancer. I had 6 previous treatments that went pretty well, then a successful scope after 6 weeks and now 3 treatments for safety purposes as I initially had 5 papillary tumors. Today I had my 8th and I had a hard time keeping the mitomycin for the 2 hours post catheter insertion. Aafter than urination to discharge the mitomycin, I ve been drinking a lot of water and subsequently urinating every 1/2 hour or so. As I uninate, there seems to be little air bubbles escaping thru my penis. Perhaps from these air bubble are little bits of pinkish colors that I assume may be blood. I m continuing to drinking a lot of water to urinate often in the hopes of eventually feeling more comfortable. Should I be concerned?