NEED HELP AM I PREGNANT?

Ok so my “friend” and I had unprotected sex on Tuesday night 11/21 and he came in me. I took the morning after pill Aftera before the first 12 hour mark hit. The problem is, my period was supposed to to start two days later on Thursday 11/23, and now I’m late. I know it’s still early to tell, i just need reassurance that I’m not pregnant. I’m a senior in high school with somewhat strict parents. So, a pregnancy is the last thing i need. Is it possible for me to be pregnant. I read online that I.T was unlikely, but i just want other people’s opinions. Please and thanks.