In denial...

So I feel like a terrible mom. I was completely convinced I was carrying a boy. Everything was opposite from my daughter. At my 18 wk ultrasound the tech super briefly glanced and said it was a girl. She went so fast I couldn't get a good look, plus I was shocked and to be honest upset. Am i a bad mom? I don't think I will have another ultrasound and I still don't believe it's a girl. Thoughts? Thanks!