i found out on my 16th week ultrasound that my baby was a girl and when i had my 20th weeks ultrasound she was still a girl.
Yes they can tell at 16 weeks. I was told at 14 weeks with 85% asssurance it was a boy. Then again at 16 weeks said boy. Confirmed at 20 & 26 weeks. I've had a lot of ultrasounds lol.
I know people that has. The accuracy goes up the farther along you are. I am sure they will be able to tell you though. I waited until I was 21 weeks to find out and it was crazy accurate!