Miscarriages

I had a dream last night that I had a miscarriage and it was the most awful thing ever. Now I can't stop worrying that when I get my ultrasound at 11 weeks I'm going to hear the words "I'm sorry but your baby stopped growing" I don't know how to calm myself down and it's making me crazy. I even tried to get my doctor to give me just the ultrasound now and do the other part of the appointment later. I just need reassurance everything is king the way it should be and I feel an ultrasound would d that for me. Any tips on how to not be freaking out. I still have a month left before the first trimester is over.