Anna, our sonographer told us at our 12 wk scan that he thought DS was a boy...although we took it with a grain of salt (I thought it would have been pretty inaccurate at 12 wks) and then kinda forgot about it for the rest of the pregnancy. We decided at our 20 wk scan that we'd wait to find out.

Wasn't until after he was born that we said 'hey, he was right!'

Personally, if I'd really had a preference about gender, I would have waited till 20 wks to have it confirmed. I just think at 12 wks they are much more likely to get it wrong and that could have been disappointing.