Gender Determination Appt.

Adriana
I have a Gender Determination appt at a private facility next Tuesday, I will be 15 weeks because I don't want to wait until 20 weeks to see my baby again! Plus, we'd like to start buying things.
Are chances high that we'll get a definite answer for the gender? Have any other ladies been to a private facility at or around 15 weeks for an accurate answer?