We found out. Firstly I don't think it makes it any less of a surprise. Its just that we were surprised at 19 weeks instead of 40 weeks. There is a lot ot still be surprised at when they actually arrive (eg. whose nose do they have? How long are they?). Plus knowing the sex made the journey nicer for us. Knowing who it was inside of me. There isn't a right or wrong answer for this one. Just what you want.