OKAY PERIOD PANIC

guys I’m lowkey freaking out but I need to talk it out with someone before I freak the fuck out completely. I lost my virginity in June, before that my period was always super late and irregular, RARELY was it on time but when I started having sex frequently, I was getting it every 28 days to the exact day. It was great but then my boyfriend left for college. The first period I had after he left, it was 5 days early and I’ve only had sex 2 times with him since that time ended. Now I sit, my period 3 (almost 4 days late) and now I’m starting to freak. I’m not on any birth control and we ALWAYS use condoms each time. I usually make him pull out before he finishes because I still don’t trust condoms completely and we always blow it up to check to make sure there are no leaks. My period is never regular so now that its being late again and I’m sexually active, I’m just worrying. At what point should I really start to worry because I’m trying to keep calm because I know stress can delay it too, just someone talk to me please before my head explodes!!!!