Do I have a UTI? How do I know?

For the second time this year, I have had a bout of what I think might be a u-tract infection, but I'm not sure if that's what it is. For about a week now I have had the urgency to urinate hundreds of times throughout the day, and could easily urinate every five minutes without problem. The bothersome thing is that, although I'm not incontinent, it is dripping a little and is therefore very unpleasant and awkward. I'm not experiencing any burning sensation, and I know that I'm not pregnant. Any advice? (I started drinking cranberry juice yesterday, thinking that might help I'm not exactly sure why).