Help! When Did You Find Out Your Twins' Gender?

by Kate
(Buffalo,Ny)

SO, where I live there's a place called Baby's Bungalow where they do 3D sonograms.. They have a Gender Determination packet which is 79$ (15 minutes of 3D sonogram, gender determination, 6 3D pictures) They can determine sex at 13 weeks & 4 days ( they claim to be 99% accurate)

I was wondering if anybody has done this and had their twin genders revealed and was it accurate. Before I spend money on something that could wait, I just want to know so bad!