Pregnancy After Miscarriage

Hello, I need some advice. I am currently 6 weeks and 3 days pregnant and had a miscarriage at 6 weeks on July 1st. I have my first ultrasound in 2 days and I'm really worried. My last pregnancy I had my ultrasound at 6 weeks exactly and a few days later my baby's heart stopped beating. When I went in for my 8 week ultrasound is when we found out. Since I'll be 6 weeks and 4 days at the time of this ultrasound I am terrified that I'll go in and they won't find a heartbeat. My last pregnancy I was so sick that I could barely drink water, I was so tired and my breasts were sore by week 4. This time I am only nauseous if I'm hungry, my breasts just became sore like 2 days ago, and I'm just becoming fatigued. I'm worried because my symptoms are not near as strong as they were last time but I'm hoping this is a good sign. I guess I'm just hoping for a little advice or some stories from you that ended with success. I am just so scared that this will happen again. I'm afraid to get attached but I desperately want to enjoy this. I just need help...