Hi Amber,
An ERPC is the operation some women choose to have to remove the "Retained Products of Conception" (that's the RPC part - I forget what the "E" stands for).
From what I can gather from your other post, you're going through this naturally, and so it's unlikely that you'll need an ERPC.
The only time you may need one after a natural miscarriage is if it is incomplete. Usually you'll be offered a scan to check that everything has passed and options as to what to do next if not.
Thinking of you x x