6 week 2 day ultrasound

Hayle • 5 yr old daughter. 1 👼🏼 1-23-19. Ttc baby #2.

So yesterday I had a scan. I called today to see where I was measured at and they measured me at 6 weeks 2 days with a yolk sac. Is it normal that we didn’t get a heartbeat or see the baby at that appointment? I go in on Wednesday because she wants to see the babe then. Anyone else just see the gestational and yolk sac and no baby yet? Can’t help but worry. Not bleeding or anything