Hi,
The answer depends on the intent of the scan. IF the scan was interested in the bladder only, then evaluation of the bowel would be difficult. A thorough evaluation of the bowel would include an enema (did you get one?), which would essentially render the bowel opaque. In the absence of the enema or impaction of stool, the bowels would appear collapsed (it is now easy to imagine how the wall may appear thick in the scan) due to the absence of adequate distention.
If the complaint was blood in the urine, the bleeding is not likely coming from the bowel. You could talk about other causes of bleeding such as kidney stones or infection (which was likely considered due to the treatment you received around the time of the scan. Stay positive.
Forgot to mention... I was on my 8th day of sulfameth/trimethoprim antibiotic when I had the scan done.