I'm very sorry for what you are going through. A m/c is bad enough, but then to have recurrent complications really *****! I had a natural m/c, then popped back into my normal cycle, so I can't really answer your question.
I see you have a dr appt Monday - good! 13 days of bleeding just does not seem normal.
Sorry to hear about your loss. I have had 2 in the past, the first about 5 years ago, had a D&C and then just got on with life. The 2nd was last Dec which was a missed m/c and I had a natural m/c but after that I did have months of problems. I didn't get my first AF for 2 months, then for a couple of months after that they were on time but REALLY heavy and then about 3 months later I had the worst pain humanly possible one night and then laster a blood clot fell out which was about the size of a golf ball. Got referred to a gyno and they think it was a burst cyst and that my body did not get rid of all of the tissue from the PG. This could be what is happening to you. I would maybe ask your doctor for a scan to see if there is any tissue left (not all D&C's work, my first one they totally missed it!!!). I think that's what my body needed though coz I am now 16 wks PG and going really good. Good luck!!