Gender Scan Results Wrong from 14-16 weeks

Marleigh
Has anyone ever been told that they were having a boy at 16 weeks and it ended up being a girl?? Just curious. Had an ultrasound yesterday and the tech said it was a boy but I'm just not seeing what she's seeing. I mean something is there but it looks nothing like what the ultrasound of my first son looked like.. could you guys give me some opinions about what you think??