Actually, many years ago in a medical supply store the woman clerk showed me to the back room (a consulting room), let me try two different sizes of Salk waterproof pants on over my disposable diaper to see which would be the better fit. She even tugged the back waist of the pants checking to see how snug they were. True, and that was amazing and totally unexpected. She was an RN though, not your average store clerk making minimum wage.
No checking your prostate or "Turn your head and cough"? Probably was too much trouble to ask you to remove your diaper for that! Seriously, hope the meds help and blood tests are normal.