Incorrect gender results?

Tamara
Hello ladies,
I had my MaterniT21 blood test done at 10+1 and got results stating a healthy boy. I was surprised because I really thought it was a girl (this pregnancy was VERY different from my first... A boy 11 years ago). I went in for a u/s at 12 weeks and had two different techs tell me it looks like a girl. HUH?! So now I'm unsure again. Obviously health is the most important thing but just curious... Has anyone else been through this? And if so, what happened? Thanks!!!