Insured under Kaiser

Any one from CA insured under Kaiser Permanente , how many ultrasounds have you received and how many weeks ?
I'm a little confused at my 8wk pregnancy orientation I got booked for a 16wk ultrasound. Today when I went in for a question and they told me my 16wk appt wasn't even booked . So after I saw my doc she said she wouldn't see my until 20wks and to book my appt up front ?