I'm Confused ??

So i start my period on friday but whats weird is that i started bleeding ,kind of like spotting i guess you can say ? & after i been checking all the time to see if im gonna bleed again. At first it was kind of brown ish then there was light blood in my panties now its gone but thats crazy becasue its never happened like that before .. EVER ! And im kind of nervous/comfused and was wondering what does this mean becasue im not trying to get pregnant !