Menstruating or Postpartum bleeding?

Hello. I hope someone can answer. I wanna ask if any of you experienced something like mine. I had my period after 28 days after giving birth. It lasted 7 days and after 3 days after having my period, I am still having blood discharge. It doesn't fill a panty liner but is staining underwear. Have any of you experienced something like this or does somebody know what is happening?