Missed Miscarriage Last Year - Sono Tomorrow

Aliza
Last year I had a missed miscarriage. The miscarriage was found when I was 9 weeks but the fetal development only reached about 5. 
I'm now 6 weeks and have a sono tomorrow. I'm so scared because with my last pregnancy at my first sonogram they saw a heartbeat but then the week after they couldn't find one and there was no fetal growth. I guess I feel like tomorrow won't bring any comfort because I know a heartbeat doesn't always mean you won't miscarry. 
I know the odds are in my favor, I'm having strong morning sickness symptoms (no fun) and I'm much more even keeled, but I can't move past the fear for tomorrow!  Help!