Oh, by 20 weeks, if she saw the junk, she'd be able to tell you for-sure, I'm sure.
https://a1.sphotos.ak.fbcdn.net/hphotos-ak-snc6/249522_10150258337321454_695531453_8983679_1554090_n.jpg
At 20 weeks, you could DEFINITELY tell that our boy is a boy...if she saw lines instead of that bump, I'd bet money you're having a girl baby.