16 week gender ultrasound

Bree • Baby girl born 6/30/15 Twin girls born 3/3/18

I had a gender scan for my twins at 16+1 and tech is saying both are girls. I’ve heard of 16 week scans being wrong. Maybe I’m just being hopeful since we have a beautiful 2 year old daughter and really hoping for at least one boy. What do you guys think? I’m not seeing the three lines everyone talks about.