period??

Faith

i am 3 months late on my period. i am 16 and ive always had a decently regular petiod. my boyfriend and i had sex unprotected the 3rd of july and it was unprotected BUT, he didnt cum inside of me. i was worried about this so i took plan B less than 48 hours later. i have taken 3 pregnancy tests and all have been negative. at this point, i just need opinions. what is gping on? is it the plan b? am i pregnant? help!