Waiting for bad news

I had a miscarriage on my first pregnancy last August around 7 weeks. Found out that I'm pregnant 2 weeks ago, currently 6 weeks. I keep waiting for bad news. Like I can't get too excited because it's all going to end like before. My first Dr appointment isn't for 3 weeks they are doing an ultrasound "to see if it's a viable pregnancy". So naturally now I'm worried it will be a missed miscarriage. Do you ever get over this overwhelming dread? Anyone else feel similar?