Missed heartbeat??

I know I’m likely clutching at straws but I had a private ultrasound last night and they couldn’t find a heartbeat. I was measuring 8+6 and dates were suggesting I should be 9+1. I don’t have a scan with the hospital until Monday morning. I will then need 2 scans by 2 different sonographers to confirm if I’m having a missed miscarriage. K haven’t had any bleeding, just a cramp back. In all honesty though, I don’t ‘feel’ pregnant anymore. Has anyone been through this and found a heartbeat at a subsequent ultrasound??