What does implantation bleeding feel like?

Im trying to determine if im having a light period or implantation bleeding. Has anyone experienced it? Does it feel like a period but is very light / hardly any sign of blood? I am irregular, so im not sure if im having my period or not. It just seems like im having heavy discharge, but it feels like my period. A few days earlier than expected, but again, im irregular. Is the idea of implantation bleeding just a scam to make me have hope? Or is it real? Been having this symptom for 3 days.