Gender US at 16 weeks

M&M
How accurate is a gender ultrasound at 16 weeks? I'm over the moon right now, I would love a baby boy, but I know sometimes there are errors because it's early! Anyone else experience getting told it was a boy and having it be a girl? This is the ultrasound we had today. 
Edit: Thanks everyone for putting my mind at ease! I'm so excited for my baby boy ❤️