HELP?!

so on Thursday July 21 I had unprotected sex with my boyfriend and it started itching a few days later, and it burns when i pee. I didn't poo for a few days, I was having some abdominal pain & back pain. The back pain went away July 23, I also had unprotected sex on Tuesday july 26, when i was having sex it was burning really bad.. It stung really bad. I had cranberry juice that night as well. Then on Wednesday Night, I was able to poo. The cramps went away & it's now the morning of July 29 , 4:52 am & the cramps came back & my period starts in 12 days.. I still itch down there & it still burns to pee...and when i wipe down there this small cottage cheese looking stuff gets on my hand... And I have used vagisil to numb the pain.  What is this?? is it jst from ovulating? should i be worried???? PLEASE HELP! AM I PREGNANT?! OR WHAT IS THIS PLEASE HELP:( I'm only 16…