Hi hon,
I am so sorry for your loss. As the other ladies have said, each MC is different my love and you could bleed for a few weeks or just a few days. After my most recent MC in June, I had an ERPC and I bled for the one day and then had my next period as normal 4 weeks later so most of it depends how far along you are.
As to how long to rest, that is your choice. No one can tell you that I'm afraid, just listen to your body and take things as slow or as fast as you want too.
Big hugs xxxx
Lee-Ann x