With #1 DD we didnt find out. Because everything was new and exciteing. I had no idea of her gender either.
#2 DS, i knew he was a he so i found out to confirm my suspicions. Glad i did cause it allowed me to prepare clothes wise etc.
If we fall again (assuming i fall while still b/fng) then ive already decided NOT to find out. And this is because we have one of each already so it would be a surprise again,kwim.
Im dont like surprises either but id hold out on this.