My stomach and side hurts on and off.but i know its not pregnancy because i've had my period.and i been safe?

I even go potty alot. none stop. but as i said the pain comes and goes. but its like a really sharp pain. its like lower stomach, and both sides sometimes. i wanted to get ya'lls opinions before i figure a way to the doctors to get it checked out. so please let me know what you guys think.? thanx....