I found out with all of mine.. I've had a few people say to me "oh, i guess if it was your first you would let it be a surprise"...nope, not for me

I think it's really down to personal preference.
I know a lot of people who want to find out, and a lot who don't. I really think it's down to you. There's no real benefit to finding out, save the colour scheme.

For myself, I like to know what colours we can buy and I also like to think of bub as 'him' or 'her'. My sister is PG with her first and she hasn't found out... at her baby shower she got all yellow, green & orange, not her favourite colours & now she is dying for some pink or blue! She doesn't care which either will do.

I'm just way too curious NOT to know, lol.

Good luck!