I heard that some people find out, but keep it just a secret between them and their OH. It's weird, I thought finding out was a relatively new/ unusual thing, but when i tell people I don't want to find out, they go, "oh, really?" although it's mainly those who already have kids that say that!
I think it is quite new, my Aunt had my little cousin 4 years ago and I don't think she was told. Keeping it between you and OH seems a nice idea xxx