When do you typically get ultrasounds

Samantha
Assuming everything is normal throughout pregnancy, when do you get ultrasounds through the doc? I've had one at 20 weeks(only one I've had through insurance, had 2 I paid for).. I'm 30 in 2 days. I don't go back to the doc for a week in a half and that's just for glucose test. I wanna see my boy and make sure everything is okay & he's growing how he needs to be.