Not trying to scare anybody here, but just passing on a personal experience.
I had my catheter taken out about noon a week after surgery. Late that afternoon and early evening I had two episodes of some discomfort in the lower adominal area (not my stomach). I found kneeling down and leaning against the bed to be a comfortable position for some reason.
At 11:30 PM I was taking my last urination when suddenly it stopped mid-stream, involuntarily. In about 20 seconds I went from feeling OK to down on my hands and knees groaning and gasping for breath. I could barely rasp out my wife's name loud enough to call her. I mean this was some of the most serious pain I have experienced. She called the on-call doctor at my doctor's practice. It took them about 25 minutes to call back. By then my wife and daughters (16 & 21) had helped me semi-dress and get downstairs. Of course, the doc could only say, "Go to the emergency room" which I REALLY did not want to do. After a total of about 30 minutes the pain eased off, and eventually went away. My doctor called the next day and said, "I heard you had some problems last night." After I recounted the experience, he said, "It was probably a bladder spasm. Nothing to worry about." Well, I was REAL leary going through my routines that day, but it never happened again, and has not happened since.
I think my poor daughters thought their old man was going to check out on them right there on the bathroom floor. But, it was "nothing to worry about." Just wanted to pass that along.