Brian and I were Team Green (ie. didn't want to know the sex). We opted at the 20 week ultrasound to keep it a surprise. We decided as well to keep our name choices at the time secret. Both were amazing experiences....the guessing is fun for everyone. Keeping the names a secret really does avoid a lot of judgement that people tend to have when it comes to names (most of which is forgotten when the cute bundles arrive)!
I was pretty certain from day one that I would have a boy. I always wanted a boy first but would have (obviously) been over the moon with either sex. I just had a gut feeling. There were certain moments where I wondered if I was having a girl but they were less frequent.