So sorry to hear about your loss...and so recent, too. You must be heartbroken.
From what I hear about natural m/c (I had an emergency D&C), depending on how far along you are you can just have a heavier-than normal AF or bleed for a couple weeks. You're supposed to get medical attention right away if you soak more than one pad an hour. Keep in touch with your doctor if you have any questions or concerns, and also if you are in pain feel free to ask for pain medication. There's no reason you should have to suffer through it. Some women that are further along get actual labor pains.
Did you already miscarry and you're just waiting for the bleeding to subside? Or are you still waiting to pass everything? Hope you don't mind me asking that.
If your body is still passing tissue then cramping is going to be normal.
Here's a link to some info about miscarriage:
What to Expect After a Miscarriage or Pregnancy Loss Diagnosis
I hope that helps. You can also visit the
Pregnancy Loss board if you want. I hope you can get back to TTC real soon, that does seem to help the grief to have something to look forward to.