Spotting a month after miscarriage.

I need help figuring out what is going on. I had a miscarriage May 2, I was five weeks along. Three weeks ago I started taking Vitex to help my hormones get back under control. Two weeks of taking it I began spotting very lightly, brown at first, then pink and brown. It's been spotting more than a weeks now. I stopping taking Vitex four days ago thinking it was causing spotting but it's still going on, off and on, daily. Sometimes it's closer to red, but also brown and stringy like mucous. But it's not a flow like a period, it's too light to be one. Has anyone had this or does anyone have advice on what it could be?