How soon can you see a baby on an abdominal ultrasound? I went today to an ultrasound sound place and the tech said she…

How soon can you see a baby on an abdominal ultrasound? I went today to an ultrasound sound place and the tech said she could see the sac but not the baby even though I could have sworn I saw the baby but she said I might not be 8 weeks yet so she couldn't really see it or find a heartbeat and scheduled me a free ultrasound for a week and a half from now. Just really bummed and nervous.