Gender wrong on Ultrasound?

I know u/s are about 90-95% accurate. When they are wrong it's usually when they think it's a girl and it comes out a boy... but has anyone experienced being told it's a boy and finding out otherwise? What were the circumstances that made the u/s read boy when it was actually a girl? I was told at 16 weeks it's a boy and I'm extatic picturing him. I genuinely had no preference going in just so happy to see my baby and know it's healthy. But I have had dreams for a week now that it was wrong and the baby is a girl. I will be extatic either way but I feel it's hard to plan when I'm not feeling certain I know anymore. Anyone else?