iliketosleep - really sorry to hear your news. You've had such a rollercoaster ride over the last month - so sad it ended this way.
I decided on the medical management way of speeding things up, because my body had shown absolutely no sign of noticing that the baby had stopped developing many weeks before, and I couldn't face waiting. It wasn't a great experience, and with hindsight I wish I'd opted for the D&C.
I agree with the other posters, that you will know when it happens properly. My bean was very much smaller than yours, and I felt it coming out. Grim McGrim.
You seem to be coping remarkably well, maybe because you have had so long of uncertainty, you've had chance to get used to the idea that the outcome wouldn't not be good. Still, do make sure you take time to grieve, and don't expect too much of yourself. As someone else said, your hormones are all over the place. Emotionally, I crashed a few days after the procedure. I'm feeling more positive now, but this may well just be temporary.
Having said that, feeling like an emotional train wreck isn't compulsory, so if you can avoid it, that would be great.
Hope it all happens soon and painlessly.