6 week Ultrasound - Confused???

Michelle Marie 👗💖❤️‍🩹 • "...I will trust and not be afraid; For God is our refuge and strength...” - Psa 46:1

Last week when for an US ... baby and yolk sac were not visible and gestational sac was measuring at 6weeks and a couple days.

Today I went for a follow up and baby and yolk sac were visible with a heartbeat and per measurement of baby, it shows 6 weeks and a couple days.

The tech says they go by baby measurements.

I am so confused. I was originally 7 weeks per my count...almost a week off.

Is this normal?

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