Gender wrong?

Can gender anatomy ultrasounds be wrong? We went in for a anatomy ultrasound & also to find out the gender but the lady never printed out or showed us babies genitals. All she said was boy, she never gave us pictures of his parts only profiles. She also was on my damn stomach for FOREVER measuring the same shit over & over again! Idk but I have a very weird feeling of would if it's really girl & not a boy being that this has never happened to me before with my first kid.