Am I?

So im 17. My boyfriend and i recently became sexually active and have had unprotected sex for 3 days now. Im technically on birth control, but i wasnt taking the pill very seriously because i hadnt been sexually active, meaning i skipped a lot of days and was late when taking it on others. I didnt take it for about 3 days before the unprotected sex. And i havent been able to take it since because i am on vacation and dont have it with me. Recently i have been feeling very sick, almost like i am about to start my period but i just had it two weeks ago . Im cramping, nauseous, bloated, have a headache, am super tired, plus i feel super hungry but when i go to eat every food makes me feel sick.. technically its only been 3 days since the first time we had unprotected sex, could i already be having these symptoms as a sign of pregnancy?