First Ultrasound 5 weeks 4 days.

Hello. Today I had my first ultrasound after a successful FET transfer. We saw the yolk sack and everything was measuring on target. But we didn’t see the fetal pole or notice a heartbeat. My doctor told me it’s completely normal not to see a heartbeat this early, and that it will probably be another two days or so before it’s visible. However for a lot of people a heartbeat is visible at this stage. Just nervous. I have to wait another week for my follow up ultrasound. Has this happened to anyone else? Were you able to see/hear the heartbeat a week or so later?