I had one dream it was a boy and one it was a girl... So I guess who knows?!?
You totes have an extra one hiding in there. One of each!
I highly doubt that happens anymore today because almost all women (in the U.S. at least...) get at least 1 ultrasound while pregnant. But when my Aunt had her boys 40 something years ago, she found out when she delivered that there were two of them =)