I HAVE NO IDEA WHATS GOING ON!?

This may be long, please read though! My period is just about 3-4 days late. The day it was suppose to start my breasts hurt just a little, my discharge was coming out as well (normal). The reason why I am worried is because my boyfriend and I had unprotected sex four days after my last period finished. He did the pull out method, but I'm worried about the precumm stuff. He didn't text me after I asked him to get me the plan B pill, and he didnt text for two weeks. I've been really worried over that time period, I was stressing but I dont know if I was really THAT stressed to cause this. I took three pregnancy tests. the first two were negative (two weeks after unprotected sex) and then I just took on this sunday AT NIGHT (negative). Now, my discharge kind of smells like my period. I'm not vomitting but last saturday I smoked some weed. AND last saturday my boyfriend and I hung out and had sex, it hurt a little when he put it in. It is now tuesday night, still nothing. Breast hurt a little, and the only thing I could think of except for a pregnancy is stress and the gardesil shot. PLEASE HELP ME, I'm 15 I dont want judgement just your opinions on the situation