😓😥help!!

So on Valentine's Day my boyfriend and I had unprotected sex the day after my period. It only lasted 10 minutes and he didn't cum in me....pre cum I'm not to sure. I was supposed to start my period 3days ago but haven't. I have the tender breast, moodines, and backaches like normal but I haven't gotten bad cramps. I usually get them real bad to were I'm up all night. I'm only getting mild ones now. I haven't been feeling sick at all, no weight gaining, no food cravings.... I don't think I'm pregnant but this delayed period is scaring the hell out of me because it was my first time having sex. I've never missed my cramps more then I do now 😭 what do you guys think?