Okay i am freaking out i need help!?

okay i was suppoed to get my period yesterday. NO PERIOD. i have NOT have since december 16th and normal periods since then like alot of blood and i used protetion then i know i didnt get pregnant then..anyway i did my boyfriend in the back seat of the car he was sitting up and he had on boxers and bball shorts andi had my underwear on. when he came seman came from the top i dont think it got on me and if it did it got on my upper theigh of on top of my underwear. but this was during ovulation, but that whole week i was supppoed to ovulate i was exercising ALOT more then i ever do and i didnt eat but maybe a salad the whole day! could i have gotten pregnant from that or do you think i ovualted a week later cuz i remember last week i got alot mroe discharge like i was ovulating but it would be late cuz i was suppoed to the week before that. i have all my normal PMS signs that i always get...so help i am crying going crazy!..i gave up back in dec. cuz of this!