We have been told at our 20 week scan that its most likely a girl...but the sonographer stressed to us that they are only allowed to say they are 80% sure...even if you go for a 3d scan they will giv the 80% sure thing too...I think its to cover their own asses in case u ring up and go "you said it was a such and such and its not!!"
Having said that, it hasn't stopped us buying a lot of pink!