It's been 1.5 months since childbirth and there's some light bleeding …

It's been 1.5 months since childbirth and there's some light bleeding for a couple of days. I went to a private gynecologist and she says everything is fine, the uterus has shrunk and doesn't see any reason for bleeding. She says it might have been a clot, but today she noticed that the blood is getting darker. Has anyone experienced this?