my friend is 10 weeks and they told her she's having a boy is there a chance it might change?

not if it's from blood:)

it was trough an ultrasound

10 weeks yes huge possibility it could be wrong. Nub theory works from 11 weeks to 14 weeks but more accurate from 12-14 weeks. Most elective ultrasound places won't tell you the sex until 15 weeks but you can find some that will tell you at 12 weeks like I did. But haven't heard of telling sex at 10 weeks via ultrasound.

wow that's crazy never heard of finding out at 10 weeks!! hopefully they can see mine at the next Dr appointment

I seen the picture of the ultrasound and you can see the boy part