If your on this thread or forum, I am sorry for the loss you have gone through

We lost the baby's heartbeat at a 9 week scan a week ago, and I have been in limbo (and very scared) waiting for an m/c to happen.
I don't know what to expect - the doctor wasn't overly helpful - just said a heavy period in the next week or so.
I have read some posts on here though where the advice has been that the pregnancy might not actually expel naturally - there was some one at over 12 weeks with a baby that had stopped at 8.5 weeks.
Have any of you been through this? I thought I didn't want a D&C, but the more I am waiting and the more I hear that natrually can be messy - I am not so sure.
If anyone has any advice or experience of either way, I'd be very grateful. I really just want to know honestly what to expect - if you want to share but its too graphic - please post me.
many thanks
Mel