Confused about ultrasound timing?

Jill

I got set up with a doctor and have my first appointment set up for July 5th (roughly 7 weeks along) And the woman I set it up with said this appointment would just be about medical history and do's and do not's during pregnancy. The next appointment is scheduled August 9th (roughly 13 weeks) When I asked if that would be the ultrasound appointment she said that would be be until 20 weeks? Am I really not going to hear a heartbeat or see the baby until September or October? Did I misunderstand her? First pregnancy and I'm just confused. Any help is appreciated :)