6 week scan no yolk sac

Madison
I went in for a bedside ultrasound today, the technician thought she saw a yolk sac but couldn't find it again. So the sac is measuring 6 weeks 1 day and the fetus is 5 weeks 6 days. I estimated I'd be 6 weeks today, the beta results came back as 14690 she expected them to be around 1600 based on my dates. I'm really worried she scheduled me to come in in another week. Has anyone experienced this and had a successful pregnancy?