Anatomy scan

I go Thursday for my anatomy scan. I already know what to expect as this is my second. I can't help but to feel like they will find something wrong. My daughter had a birth defect which resulted in a 2 month NICU stay and 9 surgeries. I can't help but feel this one will be sick too. Worst part? I will be alone at my appointment. I feel like at this point I'd rather not even know. I'm terrified.