Panorama Tests & 20 week US

Kristel
Alright, I go tomorrow for my big anatomy scan and I was already told by my MW at 11w1d that we are having a little girl. 
How many of you ladies have done genetic testing and have either 
A) the gender stayed the same 
Or 
B) the gender was wrong and was changed at your US?
Just curious to see how accurate these things really are.