Dear both, sorry to hear that you both had a MMC. I too had one in mid November last year. I had the ERPC on 18th November.
I bled very little for the first week and went for a walk and was sore and crampy and uncomfortable. I then bleed lightly but constantly for 4 weeks. I tested positive too for the 4 weeks. I was so frustrated by the lack of information and disinterest from various places that I took myself off to A+E when I awoke one morning with severe pain (about 4 weeks post op). I was given a full check over and scanned and bloods etc.
To cut a long story short, the gynae registrar was brilliant and explained everything really simply for me. Wish I had that after the op. Bleeding is perfectly normal after an ERPC, even if it lasts for some weeks after. Some people may bleed for a week, some for a few months. It is all perfectly normal. The only time that you need to get checked over is if it gets heavier, accompanied with an unpleasant smell and you feel unwell and have a temperature. I too worried about retained products but scan showed all ok. I got my period about 5 weeks after op, heavy for 3 days, that was it. Had another since for 5 days, back to normal pre-MMC.
My advice would be that if you have a little bleeding, give it another couple of weeks or so, do a pregnancy test in a couple of weeks and then ask to be scanned if still positive. It could be that there are some retained products, but the body is quite good at doing what it needs to do. If blood is brownish, it's the old stuff making its way out. Also depends I think on how far gone you were. I was 10 1/2 weeks so took a while for body to realise not pregnant anymore and for HcG levels to fall. If go to A+E, tell them that you've been bleeding continually. I know it's very easy for me to say not to worry, I was really quite paranoid about it all, but it sounds so similar to my experience. I'm sure others will write messages too. Try not to worry too much.
x