I had a d&c at 9 weeks following a MMC - it was a week after the mmc was identified though. So I guess I had time to process it a bit... And I felt weird having the baby there... But not alive. So I was glad to have the d&c, I think dealing with the physical pain of a miscarriage as well would have been like salt in the wound.
But everyone is different and only you can know what is right for you.

So sorry you are going through this. Be kind to yourself. It's really traumatic. Xoxoxo