Anyone find out gender at 16 weeks and it be wrong?

Carly • 3 little girls! Riverlynn 6/18/2013 & Rynnleigh 8/13/2017 & Rosalin 11/6/2018 and 1 little boy due 5/8/2021!
We had a sneak peak ultrasound at 16 weeks and they told us girl but her parts look nothing like my first and almost looks like boy parts! Has anyone had an early scan and they be wrong about the gender untill your anatomy scan??