Gender Testing

Francis
I'm wondering if anyone has ever done a DNA gender test? If so did it work and where is it from? I got mine in the mail yesterday (from easydna.ca it was really expensive😞 but I really want to know) I'm allowed to do it as early as 9 weeks to know the gender. I'm a bit anxious as bad as it sound to know because I currently have 3 girls and I'm praying, hoping and wishing for a boy. That being said I just want baby healthy.