I don’t have any personal stories of people I know having ultrasound predicted incorrectly however when I had my ultrasound the sonographer would only say they were 95% certain the baby was a girl because their is a small chance of them being incorrect. My sonographer actually said there was a lady who was told she was having a girl ended up with a boy and was very upset which is why the hospital never 100% confirmed gender of your baby. Still this was one case so really I’m certain that with modern ultrasounds they will be correct for you just like they were for me.
On another note have you done the nub theory? It’s sort of an old wives tale but was 100% accurate for me at my 12 week scan I submitted my scans to the nub whisperer and they said she was a girl and indeed I did have a girl.
Good luck with it all & congratulations!