14w gender ultrasound wrong??

Li

Hi everyone, I just had my u/s and doc said baby is measured 14w. She said she thinks it can be a girl but she’s not sure. Then again she said I’m sure it’s a girl when she saw the nub but I didn’t get to take pics.

Is there any chance she might be wrong? Has anyone been told girl this early but then birthed a boy?

Tia