You can tell if it's a boy or a girl with an ultrasound, but the best time to see the gender is around week 15. Sometimes we can determine the gender from week 15.
The ultrasound machine we use is called Voluson E10, a machine from General Electric Healtcare that creates very good 2D, 3D, 4D images.
This device is considered to be one of the best and by far the most advanced on the market
HDlive is an extraordinary rendering method that generates incredibly realistic images of fetuses from sonographic data.