Has anyone had a 15 week ultrasound be wrong?

Marah
I paid for an early gender ultrasound at 15 weeks and I'm being told it's a boy. I don't believe it at all. I wish I had waited longer. I'm thinking it's a girl and her parts just haven't gone all the way in. 
Any thoughts? Any hope? 
These are the ultrasounds I got: 

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