Constant uti

Every time I go see my obgyn she has me use the cup to pee in and every time she calls me back saying I have a minor uti showing up. I only drink water and I can't have salt really because I'll need my gallbladder out after the pregnancy. She prescribes me medication for it but I honestly just don't like to be taking medication during my time, just the prenatals. Any of you ladies have similar results and been prescribed pills?