Please Help Pregnancy Scare 😭

My period is supposed to be here in 2 days. I'm really nervous because I had sex on the 23rd and we used a condom but it came halfway off when he pulled out. I have been having really bad back pain which is normal a few days before my period, but I also wanna eat everything in sight and have horrible acne. Is there any way I could be pregnant? And how else could I tell if I might be like symptoms? No access to a test