Spotting

Ellie • 17 Years old ! Taken by boyfriend for one year now

I usually only spot brown blood a day or two before my period. Now I have been spotting little blood for like 4 days now and I'm very scared what's going on because my period is supposed to start not for another 3 days. Can anyone tell me if I'm freaking out or there's a reason? I also had unprotected sex and precum may have been inserted. I'm not pregnant right... RIGHT?