BiscuitStuffer, so sorry to hear you've been going through this. I had a mmc last year - baby died at 8 weeks, we found out at 10 weeks, and it wasn't until about 11.5 weeks that I started to bleed.
Unlike some of the others here, I had absolutely no idea that anything might be wrong - I only found out due to a scan I had after the tiniest amount of bleeding possible, which I assumed was just 'one of those things' but got checked out anyway.
I still had most pregnancy symptoms even after I found out about the mmc (although some had improved around 8 weeks). I chose not to have an ERPC and let things happen in their own time. I bled for about five or six days; reasonably heavily but nothing terrible. I assumed that since it was pretty much like a heavy period, everything inside me was breaking down and coming out in bits. However, on the Friday night I had half an hour of pretty bad griping abdominal pain (a bit like period pains only worse). On the Saturday night I had the same again, but for an hour. On the Sunday evening, I had it again, really painful for about 3 hours. In the end it was so bad that my husband had to take me to the hospital because I was so desperate for some pain relief.
It turned out that the pain was actually contractions because the foetal sac was still inside me and my body was trying to get it out. It all came out in one piece in A & E, which was a bit of a shock as I'd previously assumed it had all broken up inside me. They kept me in overnight, did some tests and found out there was still some tissue inside me. I then had the choice as to whether to have an ERPC or just let things sort themselves out - I chose not to have an ERPC. I bled for a while afterwards (a week? fortnight, perhaps?) but didn't have any more bad pain.
I wish I'd known when I decided not to have the first ERPC that I could end up having contractions and delivering the foetal sac all in one go - all of that was a bit of a shock, and I didn't have any painkillers at home stronger than paracetemol. However, I think I'd make the same choices again next time. Letting things happen naturally gave me time to come to terms with things.
Whatever happens, do keep an eye on how tired you feel afterwards. I suffered from complet exhaustion and depression for 7 months afterwards, even though I had coped pretty well with the miscarriage itself and came to terms with it quite quickly. It turned out that all of that was due to me having low iron levels as a result of all that bleeding - within 2 weeks of starting the supplements I was a different person, no longer exhausted & depressed.
Make sure you take care of yourself and I hope things aren't too horrible for you.