First ultrasound couldn’t detect heartbeat or find baby.

Heather • Momma to a beautiful baby boy. Baby number 2 coming August 2021 🤰🏼

Had my first ultrasound today. Vaginally. I’m supposed to be 6 weeks 5 days but baby is measuring a week behind. They couldn’t find the baby or heartbeat and I’m scheduled to go back next week. Is this normal?? Has anyone had this happen and everything okay? They found the yolk sac and she thinks she may have found baby but wasn’t for sure so didn’t call it baby. I’m literally FREAKING