How common?

Grace

I have my twelve week scan next week, and I can’t stop worrying that they will tell me there’s no heartbeat. I had an early miscarriage two years ago, and I can’t shake the feeling that something will go wrong again. I’ve tried to find statistics around what percentage of 12 week scans uncover missed miscarriages (like, I know this happens, but how common is it?) but I can’t find anything at all. Any ideas?