Maternity 21 plus

I didn’t really know that I was screened for this at my first appointment 2 weeks ago. Saw my results today and am really happy about it 😊 All negative and I’m having a girl!💖 Just what my fiance and I were hoping for as we already have a 2 year old boy. Anyone had taken this test before and gender of baby was right? I read that for some it wasn’t right?