Sorry for your loss beetle. I had a twin mmc at 18 weeks and delivery 2 1/2 yrs ago. I remember the bleeding trailing off after 3-4 wks and then starting again with clots and from brown back to red, I did finally stop after 6 weeks, but it felt like forever at the time. Didn't check it out as I have ostrich syndrome but I've always had high iron count so no anaemia, there's no harm in checking it out if you're worried. Take care of yourself.
Beetle, I am so sorry for your loss. I'm afraid I don't really have relevant experience as my own pregnancy loss was much earlier than yours but I am sure someone with excellent advice will be along soon, I just wanted to acknowledge your post and offer some support.
Have you spoken with your GP/the hospital about the bleeding yet?