Hi Charlie, so sorry to hear your news. I joined this thread after two, so no worries there.
What a predicament for you! I understand not wanting to be alone, just for some comfort and someone to bring you tea/wine/chocolate.
All mine have been natural MCs, and I have usually started bleeding within a week of the pg starting to fail.
My acupuncturist will hasten things along for me when I MC, so that is definitely an option. I also recommend raspberry leaf tea by the gallon to get things going, lots of painkillers including some cocodomol, and not trying to be a martyr and go to work.
The amount you bleed will be different every time, and it might not be as heavy as you dread.
People here recommend catching any "products" (a truly horrible name) for testing, if your hospital will do it. You need a sterile container, like a piss pot, if possible, and put it in the fridge until you can get it to your local epu. This would be able to tell you about any genetic issues with this pg, and is the first step to finding some answers.
We're a pretty supportive and knowledgeable bunch, and are here if and when you need us.
Good luck x