So I performed oral sex today. and I've done it 3 or 4 times before. but this time i guess i was sucking harder and halfway through it hurt to suck and when i stopped my cheeks felit weird. I kissed his neck and there was blood...so i checked in a mirror 3 minutes later and my cheeks were cut up and the back of my throat is all red and there are 2 dark spots that look like sores. i dont know whats wrong like i have done this with the same guy previous times recently.

Please help...do i have an std? or did i just cut myself with my teeth or something..? I'm really scared.