6 weeks, yolk sac no baby😫 help⁉️

Auja

So I️ went to have my first ultrasound done yesterday turns out I’m 6 weeks along but we only seen the yolk sac and no baby, and as first time mom every little thing has me on my toes🙄 Is this normal ? Can someone explain it to me ??? 🤦🏽‍♀️