Go To The Doctor!!
Reasons like this, looking online for answers is showing that you are way to immature to be a mom! I'm sorry. But if it was me who was concerned about my baby, I'd be in the ER if the doctor couldn't get me in soon enough!
BTW, sever cramping in the first trimester can be very normal. It's still something you should have checked out to rule out any problems. You really need to be under regular care if your having UTI's anyway. Infections can cause birth defects and miscarriage. Not always, but it is possible.
Do your parents know? Are they concerned at all about you and your baby? of do they think your just having a bad period?