I'm so sorry for your loss - it really is an awful feeling.
I had a MMC (about 9 weeks) in Feb followed by an ERPC at the beginning of March. I had to wait a week for the ERPC, and I think during that time I did a lot of my crying, hating the world, and trying to come to terms with things.
I actually felt a sense of relief after the ERPC. I know that sounds awful, and it's something I've discussed with other ladies on this board, but I found the in-between stage the hardest to deal with. I felt as though I was in a horrible limbo. I was pregnant, but not pregnant, and I was having to deal with the shocking news while I was still hormonal. I also had a 23 month old toddler to look after (although it probably helped to focus on him a bit). I think it helped me to be physically 'not pregnant', rather than just technically 'not pregnant', if that makes sense.
Physically, I didn't feel too bad afterwards, just a little fragile. I didn't have any pain. I was really drained over the following days though. I think it was partly physical and partly emotional. I only had very light bleeding, and that lasted for a couple of days (although I understand from others that sometimes it can last longer).
I rested a lot, took some multivitamins, and was kind to myself. My DH took as much of the workload at home as possible, and I didn't rush back into things. I accepted any help that was offered, and I ranted on MN a bit too.
So you should find that you are physically able to go back to work, but I wouldn't recommend rushing back if you feel you need time for emotional reasons. It may be better to wait until you've had the ERPC and then decide.
Again, I am so sorry for your loss.