I believe it's anywhere from 16-20 weeks! I found out my first at right about 16 weeks.
Well if ur waiting for a sonogram then they usually do it around 20 to 25 weeks. They also have a simple blood test were u can find out as early as 10 weeks
You can get a 3d ultra sound if you want to spend the extra money, i found out with my 1st & 2nd at 14 weeks. & then again when they did the ultra sound at 25 weeks.
I've had three kids, on my fourth and my Dr always did the ultrasound gender test at 18 to 20 weeks so you can have it done anytime now
I got told I'll find out at my 19 Week scan :)
I found out at 18 weeks :-)
Today Im 19 weeks 4 days and I find found out today I'm having a girl #firstbaby