First time mom here. I have my next ultrasound coming up in 2 weeks. I will be 17 weeks and my dr says she should be able to determine gender at that appointment. We are going to have her keep it a secret and put it in an envelope so my dad can plan a reveal. My question is, did any of you guys find out around that time, but at later visits get told they were wrong and it was actually the other gender? Or is it pretty accurate at 17 weeks?