How many weeks am I?

Li

Positive opk on 11/22, and my first positive pregnancy test was on 12/6 with clear blue digital saying 1-2weeks.

But first day of my last period was 10/16?...

How many weeks am I? Because I went in for ultrasound (both ways) yesterday but they couldn’t find the sac.

Am I still early or should I be expecting the worst?... I’m not bleeding or in pain...

Thank you for the help in advance? 🙏