I had pms symptoms 2 days ago: cramping, acne, back pain and mood swings but they're all gone now

I'm 15 years old and exactly one week and a day ago, my boyfriend and I had sex. He finished inside but he was wearing a condom and he assured me that he checked and there were no rips or tears. I'm freaking out though because my period is 4 days late now. I had pms symptoms two days ago like cramping, acne, back pain and mood swings but they're all gone now. I've only been using my period tracker app for about three months but it's been pretty accurate so far and I think that this is the latest it's been. Also this is only the third time I've had sex with him and it was the first proper time because the first time we both didn't really know what we were doing and the second time we had to stop after like ten seconds because his dad came home. I'm really worried could I be pregnant or could my period just be delayed from the sex or something