Sorry...I also meant to add in that I'm very sorry for your loss.
I guess it might depend. If it was an early miscarriage then some people say to do it right away. If it was a baby that was more developed and later in pregnancy...then I think many doctors would want you to heal physically and emotionally.
Many people want to have 1 or 2 cycles first...just to get back on track and you would then be able to better determine the dates if you ended up conceiving.