Is she wrong?! I went and had an elective scan done at 17 weeks and she said its a boy but everyone…

Is she wrong?! I went and had an elective scan done at 17 weeks and she said its a boy but everyone else seems to tell me that they don't know what they are looking at. Anyone know?! I'm going to be very sad if I went and got boy stuff and it's not a boy. I will be happy for a healthy baby either way but still.