Period? Or....

Shelby • Have a little family, my husband & my dog, Charlie. hopefully soon an baby. ❤️
I am 5 weeks and 5 days post part in. About 4 days ago I started bleeding again. And I'm not sure if it's still the "stuff" coming out or if it's my period. Help! I stopped bleeding at 4 weeks and 3 days. And then was "dry" for a couple days, and then started bleeding. What could it be? Should I be concerned? I am also breastfeeding I don't know if that matters.