Yesterday while I was at work, I had to pee so much. It seemed like it was almost every half hour. I don't ever have my period, its very irregular ever since I started. But also, it was burning a little too. But I was wondering what the causes of utis, are. I've had sex lately also. On more thing, it was only like that for that day.now today (the next day) it isn't like that anymore. I'm so worried please give your opinion?