Anyone experience this ??

Savanna

So i went for my ultrasound today I should be 8 weeks 2 days and the tech said I'm measuring 6 weeks 2 days, and all she could see was the gestational sac and yolk sac. She said she couldn't see the fetal pole but it might be just to early and to come back in a few weeks?! Anyone else experience this ?? Feeling worried..