Hello, Mya!
Sorry to hear about your father. Nothing will really be known as to exactly what his diagnosis is until after the surgical procedure. The urologist will remove as much of the tumor as possible as well as bladder tissue around it. These will be sent to the pathology lab for analysis. This report, which may take a week or so, will tell the urologist exactly if it really is cancer, what kind It is, and how far it has progressed if at all. Until the pathology report is received, nothing is definite even though the urologist may have a pretty good idea based on his/her experience.
Blood in the urine is one common symptom of bladder cancer. Pressure in the abdomen, not so much.
Once the surgery is over and the pathology report is in hand you will have a better idea of what he might be facing.
Wishing you and your father all the best.
Sara Anne