My Boyfriend and I are both new at sex, we started about a month ago. We got curious what it was like without a condom (I am not on any birth control) So we tried it for maybe ten seconds, and put on a condom and continued. We have done this twice now, he didnt ejaculate until probably twenty minutes later or longer. I normally miss periods even as a virgin, I can go months without them. But It should be this week. The first time we did this was two weeks ago and the last time was yesterday early morning. So I took plan B knowing after being concerned about my period and took precautions. I only took the pill 7 hours ago roughly. I have pain after I pee and urge to pee since i took it and I am bleeding / spotting. Is this my period? Could it trigger my period? It is supposed to be this week. And the pain after I pee.. is that a side effect or a possible UTI.

My question is
A) is it possible I am pregnant?
B) Is it possible I have a UTI or is it normal.