Spotting

I just got back from a night out and I realized I had a bit of spotting. I’m a birth control and me and my boyfriend had unprotected sex exactly month ago (didn’t even cum). I know it’s most likely not a pregnancy but I’m just scared (btw I know that sounds a bit stupid—spotting = pregnant but I’m a teen and idk I’m nervous about that kind of stuff). Also, since it’s probably not, is spotting normal a few days before your period? I’m supposed to start on Tuesday. Reminder that I’m on birth control.