2 weeks 2 days behind expected due date?

Hollie

I had my first appointment today and thought i was 8 weeks 2 days, but I’m only measuring 6 weeks. There wasn’t much to see, but they said they thought the could see a little heartbeat flicker... I’m so worried and I have to wait u til December 3 for another ultrasound. Has anyone else experienced this and everything was okay? It just seems like a dramatic difference in weeks 😓