I had blood and was also on blood thinner Eliquis. Paused the BCG treatment one week because of that. Urine sometimes as dark as cabernet wine. After getting my Afib under control, Cardiologist had me stop the blood thinner. Urine eventually cleared up. However, I failed any benefit of BCG. Going for third BC surgery this week followed by Adstiladrin treatments. Hope that works. Cardiologist installed a loop recorder to make sure the Afib stays under control and to (hopefully) keep me off blood thinners.