scared, I dont want more bad news.

I go in for another ultrasound today at 3. I'm freaking out. I had one last Thursday when I was supposed to be 7 weeks exactly. apparently I only measured 5 weeks and there was no yolk sac or fetal pole. I'm not sure how to handle this. I've had horrible anxiety and just have been thinking the worst. I don't want to get my Hope's up. And plus its only been 4 days, can that really make that much of a difference??? trying not to stress but it's not working.