I Have Had ICS Of The Bladder For Several Years.

I have had ICS of the bladder for several years. I have a stim implant which helps to prevent accidents. Mother was in original Elmiron study at Penn. Too far gone, had surgery with a bag outside the body;
Is it normal to have pelvic pain (almost like cramps) and pain the legs primarily in the back, thighs and calves or could it be something else?