Confused about dr calculated due date

Katherine

So I spoke with my dr.’s office yesterday to schedule my first appointment. I told them the first day of my last period was December 26th. The girl in the office then said I had to wait to be seen until I was 8 weeks which would be March 21st.

The calculators I’ve used say I’m already at 8 weeks or at least 7. Should I call back and try and be seen earlier or am I wrong? Help!