Gender at 12w4d - Nuchal Translucency Scan

Hi ladies!
I had my NTS last week and the doctor told me that according to his findings we're having a girl. He gave us a 94% surety. In your experience, how accurate is this prediction? We've decided not to tell anyone yet, as there might be the slight chance that he is wrong. Or can we be quite certain that it in fact is a girl?