Normal??

I am 5 weeks post partum and my baby is ebf. I pretty much stopped bleeding about a week ago. It had turned to like a super light color tmi. Anyway, two days ago I started having dark red blood again. And it’s been consistent for the past two days. Is it possible that I’ve started my period already?? With my previous pregnancy I was breastfeeding and didn’t have my period until 8 months post partum. I go to the dr for my 6 week check up on Tuesday and I’m worried about having to cancel bc I’m bleeding!