The waiting game...

I had my first US earlier this week. I was expecting to be 8 weeks or so, US showed a gestational sac measuring 6 weeks with nothing inside. We did blood work to get a better idea of whats happening. Original HCG level was around 15000, second was 16000. They scheduled me for another US in two weeks to see if anything progresses, but I dont have much hope. I feel like Im just waiting to miscarry. Its an awful feeling.