The midwife i saw at our hospital said that she has delivered about 13 bubs that came out different to what the parents thought - all came out boys and were all thought to be girls! DH wants to know the sex but i figure unless it can be 100% accurate, i'm still going to wonder. So we're keeping everything unisex until the birth. The only the other way is if little bubs obviously salutes us at the 19 weeks u/s and i can see it! It's hard though - i'm sure it will be harder on the day of the u/s, got ot be strong though!!