Didn't you ask your doctor these questions?
Sorry you had to go through that, miscarriages are so terrible. I had a d&c and got my period exactly 28 days later. My doctor said to consider the d&c "wiping the slate clean and starting fresh" and she was right, my cycle picked right back up and was regular. I don't think it's the same for everyone though, I was lucky.
All doctors have different opinions on when you can conceive again. Some say give it one cycle, some say 3. My doctor said I should have 1 period before trying again. I got pregnant 3 months later.
Sorry for your loss. Good luck trying again!