Ultrasound tech said I'm measuring 8.6 instead of 9.4?! Anyone experienced this before?!

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Ultrasound tech said I'm measuring 8.6 instead of 9.3?! Anyone experienced this before?! We paid out of pocket today for an ultrasound before my first prenatal appointment. I wanted confirmation before telling family on Christmas. My appointment with my doctor is in 7 days. I just couldn't wait. The tech made a comment that I was measuring smaller than 9 weeks and 4 days. She said the baby was so tiny but the heartbeat is strong at 158. ❤️❤️ What are your thoughts?!