K.P.
Mommy2two's answer sounds like exactly what happened with us, except that with my first I really wanted to know and my husband really didn't. He missed an appointment, and the tech told me that it was a girl. I made a comment one day while looking at some cute little duck sleepers and made the comment that one looked way to girly to be gender neutral. My husband said at that point he knew it was a girl.
With the second, I didn't find out. I knew he was going to be a boy, but never confirmed it.
If I had to do it over, I would probably not have found out with either. My instinct was right in both cases (so was my cousin's). The chinese calendar was also right.