So worried

Crystal

Two weeks ago I had an ultrasound that showed I was 5w4d it had a gestational sac with nothing in it and today 2 weeks later I had another ultrasound and it showed I was 6w1d with a yolk sac and gestational sac has grown a little. Im still having pregnancy symptoms and I'm not bleeding. I just am so worried. I'm so worried that this is not looking very good. Has this happened to anyone else and what was the experience? Thank you