Am i pregnant...stomach pain, back pain, clear urine

Okay so to start it off Im 16 years old. I always have protected sex. On the last day of my period (18th of june) I had sex and the condom broke. He pulled out the second it broke. And then I had it on july 1st and the condom broke again...but im positive this time that he was barely in when it ripped and took it out right after it and we both peed right before sex. Now im getting these weird middle/lower back pains and my tummy area is feeling funny. But today I peed like 5 times in the afternoon. I did drink a Mcdonalds sweet tea...which might be why I peed so much (too much sugar). I only drank that and a little iced tea today, and my urine had a little tint, but pretty clear. My 28th day from my period (when i was suppose to start my next period) was Monday, but usually I get it on the 30th day which was wednesday and I did not get it. Its now friday and i didnt get it. Im worrying a little which is why I thought I havent been getting it. Do you guys think Im pregnant? Or maybe a UTI? Please help! I dont really think Im pregnant, so if you can calm me a little, please do. its just been constantly on my mind (which is why i think i havent gotten my period). thank you