I didn't have to have a catheter being a small tumor. However, I did bleed for a few voids (if I can remember far back) thus I presume what you are seeing is a byproduct of your TURB. I would still call your URO tomorrow to be sure if they didn't cover what to expect. A lot of times what looks like a lot of blood is often not much-according to my wife, she is a crusty ole maternity nurse so what do I know!