I've heard of it happening. We have been told we are having a girl but we both know we may have a boy. We really are happy either way. We have a boys name and it will just be a matter of getting more blue clothes. We have been keeping the room unisex so we don't have to change it all over for bubba 2 if it's a different gender. Part of me would like to be certain but part of me enjoys still not being 100% certain.