Ultrasound predict gender wrong?

No Actually mine was completely accurate.I didn't have my ultrasound until 21 weeks 5 days though so I imagine that helped some.Also my doctor done the ultrasound & she done better than I have ever seen a tech do.We had a clear shot & you could tell for sure that it was a boy.I am sure it happens in some cases though.If you are unsure,you could wait until later & request another ultrasound..Congratulations.