I was not able to know the gender of my baby until I was almost due in my first pregnancy. Then now that I am second time pregnant and almost 7 months, my baby is also not willing to reveal the secret.

Anyway, doesn't matter girl or boy, my husband and I are both happy, so long that the baby is healthy.

yes, the scanning result could be wrong.. happened to my sister.
Actually you can start buying stuff for the much babies earlier .. no different if girl or boy .. the concern might be on clothes .. learned from my sister's case, my wife and I bought few neutral/boyish cloth before the birth and bought a bundle of girls cloth after my daughter born .. since my wife couldnt go shopping it was all the father's choice ..hehe