Okay UTI question...?

I have a UTI. I know I do because I have had them before. It is just starting. I started drinking a lot of cranberry juice and have also taken an Over-the-counter UTI relief pill. Will this clear up on its own or do I have to get an antibiotic? I don't want to take an antibiotic because I am on the pill and I don't want it to be ineffective.