Baby measuring a week behind + no heartbeat

I went in for a scan on Monday when I thought I was 7 weeks and 3 days. Turns out baby is measuring 6 weeks and 1 day. No heartbeat but everything else was there. The NP scanned me first and she seemed to think it was not viable. She got a doc to come in for a second opinion and she seemed more reassuring. But they both prepared me for a miscarriage.

I have a follow up scan next Tuesday and I'm a wreck. I can't stop expecting the worst but I also am so acutely aware of any ache and pain in my body as if I could be miscarrying. I know I just have to wait it out. I keep reminding myself of what we know to be fact so far.

Has anyone been in a similar situation? Any advice or words of comfort you can offer?