Hi girl? I'm almost a month postpartum, ( I have many internal and ext…

Hi girl? I'm almost a month postpartum, ( I have many internal and external tears + a cut) and something started bleeding again today and yesterday. It's been so long since I had blood, there were just yellow discharge for almost two weeks after giving birth, there was a very strong bleeding during that time... And during labor I lost a lot of blood. That's why I'm curious, why is it starting to bleed again? I think I follow all the instructions, I don't sit down, I do everything standing up and lying down, I wash myself with iodine constantly, then I take levomethadone, is it normal for blood to start flowing again?