Appointment schedule

Hey everyone! First time pregnant here so I still basically have no idea what I’m doing or what to expect but my current question is: how often is everyone seeing their doctor?

I’m just about 16 weeks and the only time I’ve seen my OB was at 8 weeks for the initial prenatal. I did the NT US and first trimester bloodwork at 12 weeks but that was just in a lab.

Should I expect the office to call me when they want to see me or should I be calling them? I have no idea what is normal or not.

Thanks for any input or advice!