Good evening. It has been 5 weeks since childbirth, 2 weeks were bleed…

Good evening. It has been 5 weeks since childbirth, 2 weeks were bleeding like blood, for 3 weeks as if there was still some residue. And now it's already the second day of bleeding like blood. Can menstruation start so early or is the uterus completely cleaned out? Has anyone else experienced this? We are exclusively breastfeeding.