Heartbeat Check

Carlyn
Hi! I have my first nurses appointment on 12/2 where they do bloodwork (I'll be almost 7 weeks). They said they don't listen for a heartbeat until my first ultrasound on 12/24 where I'll be almost 10 weeks. Is that normal? I don't really know what to expect I just thought they'd listen for a heartbeat the first time. Just curious 😊 Thanks!