My experience so far:
I'd had the DS scan and "12 week" scan at 13 weeks and a more in depth scan at 20 weeks. I had an separate appointment for the 20 week scan, not for the "12 week" scan. they asked me if I wanted DS screening by scan or blood test, I said scan and was put in the queue at the end of my first appointment.
I got an appointment about every month after that, then every 2 week from week 30 and I have been told that I will get weekly appointments from week 36.
I have not seen a doctor at every appointments, just the midwife.
However, compared to the UK, I have been seen by a doctor more often (never in UK until the day I gave birth) and I have had more appointments and tests ( such as 2 Glucose tests - none in the UK).
Maybe because I am classed as ancient since I'm 40 this year?
That's with a straightforward pregnancy.
This is not PY but public at QMH. I would imagine they follow a similar protocol though.