oh gosh!!! you usually don't find out until you're about 4 months! at your next appointment ask!! ask as many questions as you can! the drs dont mind! this is your first baby!!!!
anywhere from 16-20 weeks but most doctors do it at 18-20 weeks. Unless you find a 3d place in your area that will tell you at 16 weeks but you'll have to pay for that.
normally around 20 weeks you will have a scan and they will let you know if you ask them but be warned sometimes the baby gets shy and refuses to show what it got good luck