What kind of bleeding is this? Implantation or light period? Please answer!?

Doesn't seem like implantation bleeding, since you say you're irregular... you know it's completely unpredictable. Implantation bleeding lasts 3 days tops. So if it's been 6 days, I'd say it's just a very light period... or getting ready to come. If you start getting any other symptoms wait about 10 days, and take a pregnancy test just to put you at ease. (: