7 week ultrasound

I had an ultrasound done at what I thought was 7 weeks 1 day. I have an extremely tipped uterus so they did a transvaginal. The tech said she saw the flutter of a heartbeat but it was hard to tell because it was so small, and she couldn't hear anything to record. She said I was measuring at 6 weeks 3 days too... Of course I'm assuming the worst, especially because my hcg only went from 15,000 to 22,000 in two days. Does anyone have any success stories with any situations similar to this? I feel like crying and don't know what to think!