20 week ultrasound as first???

Katlyn
My OB doesn't do the first ultrasound until 20 weeks. Starting at 12 weeks we will hear the heartbeat every 4 weeks and as long as nothing is wrong with that, we will not have a first ultrasound until 20 weeks. It's so anxiety provoking to wait so long to see the baby. Has anyone else heard of this or in the same boat with their doc?