UTI's need to be tested to see what is causing them. Different antibiotics may be prescribed. I know I have a UTI due to increased need to urinate and sometimes I'm just not sure. Drugstore sells a test (XO) and it says it tests in two directions. If Positive shows, see your PCP. Different antibiotics for different things and don't stop because you're feeling good. Complete the course. (I am not a doctor nor do I play one on television)