First Ultrasound Tomorrow!!!!After First Pregnancy Miscarriage.

Well, tomorrow is my first utrasound, i should be 12 weeks now. I'm extremely nervous because of our first pregnancy about 3 years ago. We had a blighted ovum and saw nothing but a empty sac. We was devastated. We're hoping this is a rainbow baby. I can't help to be so scared for tomorrow. It would kill me to go though another loss. Trusting in god, everything is okay. Anyone ever been though this, that can give me some advise.