Harmony Testing - 12 weeks!

Natasha
Have any of you other mommies to be had the harmony testing done at 12 weeks to find out the gender of your baby?? How long did it take to get the results back and is it painful at all? 
This option wasn't available when I had my first child and this is my second. I'm 12 weeks tomorrow and my testing appointment is tomorrow. Was just wanting some heads up or some advice because I'm super excited but I'm really nervous too!