Late Period

So my period is about five days late and my last period was one-two days after I had sex with a guy (two days in a row unprotected), but he came on my stomach and I was on birth control and had been almost religious about taking it for like a month before. I went home a day later (I was on vacation when I met him) and got my period. My last day of birth control was a Sunday, the day before my period, and I hooked up with him that night (for the second time) and I took one of my friend’s birth control because I had ran out. I don’t know if hers were the same or different strength or how that works but our packs looked exactly alike and I’m pretty sure hers were the progestin pills or whatever they’re called. Anyways, I wasn’t able to get mine refilled until that next Thursday which means I was off the pill for three days (from Monday to Wednesday). I had my period on that Monday I left (the 9th) but I haven’t gotten it yet. I did research on it and it says it unlikely to get pregnant two days before your period and having been on birth control and using the pull out method I feel like it’s really unlikely, but I’m starting to freak out... is there a chance that i’m just not getting my period because of missing those days of birth control and what not??? Help!