I had always heard that it was too early to tell the baby's gender at that stage, and any guesses by the sonographer were just that - guesses...

I asked the sonographer to guess for me at my 12 wk nuchal scan... she guessed a boy, and she was right though....

I have heard of people finding out the gender at 15 and 18 weeks though, so I'm not sure about the 'legally bound until 20 weeks' thing...

But it is terrible to think of people aborting at 12 weeks because they were not happy with their bubby's gender...