I'm Having A Light Bleed, But I Ended My Period Last Week?

Well let's see, I ended my last period last saturday. Well today adn last night I was having a light bleed, and i mean VERY light bleed like i did last week but then it turned into a heavy flo like a normal period. What I don't understand is the light bleed? I'm kind or worried because I have done had my period for this month. What does the light bleed mean? Should I take a test to see if im pregnant? But I had saturday while I was still on my period, so what does it mean?