Scared i’m pregnant...

On a day where my rate of pregnancy was very very low my bf and i had sex but he wore a condom. I’m not on birth control. Mid-way, he noticed the condom wasn’t on and i reached inside of me and got it out. Now my period is supposed to be starting today but I haven’t had any cramps which i almost always do, but i’ve been nauseous which is probably because of my anxiety. I checked my areolas to see if they got darker or anything and they haven’t, but I just can’t seem to shake the thought that I may be pregnant. I know there’s no way to induce a period, but I’m going insane. Please if there’s anything that would help like symptoms that aren’t in PMS that are pregnancy symptoms please tell me because they’re so similar and I just need to know. If my period doesn’t start in 2-3 days i’m gonna test, and if it’s positive I have a plan.