Where i went you had to be a minimum of 15 weeks but i personally was 16 its a boy !
I'm 16 weeks I'm dying but they told me they can't tell yet
My next appointment I'll be 19 weeks nd find out for sure
I found out at fourteen and it was confirmed at twenty
They can try at 12 but very unlikely I found out at 19w2d
Anywhere from 16-20 (unless you pay for a 3d/4d). I found out at 18 weeks with my first and this time will be 20 weeks.