anxious before 12 week scan

Laura
I have my 12 weeks scan a week today and I'm so worried about it because the very few symptoms that I had (fatigue, sore boobs and hunger) have pretty much disappeared this week and I just feel normal again. I'm so worried that the scan will show that something has gone wrong and after my last pregnancy ended in mc I don't know how I would cope with that. 
I've not had any painful cramps or bleeding but I know that mmc's can happen. Does anyone else feel like this or am I being daft?