OB &Techs &gender. ..

Maia
I was wondering when you find out the gender of the baby does the OB Tell you or does the ultrasound tech tell you? I am 17 weeks and will be 17 weeks 1 day when I go to my doctor next, can he tell me the gender or do I wait till my next appointmentv with a ultrasound tech? Plz Help, first time mommy. ...