Found out at 14 wks with my second and 23 wks with my first.
I had a Maternity T21 test done at 10 weeks and found out i was having a boy 11 weeks.... Didnt see his private on the ultrasound till 20 weeks
I found out at 15 weeks. If you go to any 3d ultrasound company they usually have a cheaper package if you just want to find out the sex. They can tell you as low as 13 weeks along.
I found out at 16 weeks. I went to an ultrasound school where students practice on you and the teacher checks the sex. And then it was confirmed at my anatomy ultrasound we are having a baby girl :)
My friend found out at 16 weeks
Your doctor can tell you better than me, but for mine I found out at 20 weeks.