You could be counting your lmp wrong. That's what happened to most including me. Especially for those with irregular period. I thought I was 11 weeks + when I had my 1st dating scan but turns out I was only 10 weeks pregnant. Even with a period tracker app, I was still wrong. Wait for your next appointment. By then maybe can see or hear the heartbeat.
Im suppose to be 12 weeks base on LMP but doctor calculated the CRL and Im on 11 weeks. :) Sometimes we miscount bec we thought we ovulated on that day.
Same here rn