We found out with both, with DD1 we weren't going to but then DP changed his mind so we 'flipped a coin'
I am so so glad we did though as i got to tell my nan we were having a girl and using her name as a middle name, she died 3 days later, she had asked me from day 1 what girls name we would use and we didn't have one picked, when we found out we were having a girl the name came to us and we used it and told her straight away.

With DD2 we found out for financial reasons, i had given all my neutral baby clothes to a friend who desperately needed some help and we couldn't really afford to go out and buy all new neutral clothes and sheets etc.