With DS I was convinced he was a boy - and he was. With DD (not yet born) I knew she was a girl.
I also have a really strong feeling that she's going to come early. Not premature, thank god, but maybe around 37 or 38 weeks. I'm 33 weeks now.
With DS I guessed his birthday as the 1st, which was the day I went into labour, although he wasn't actually born until the 3rd.
Do you think there's anything in this or just coincidence? DH thinks lucky guesses, I think somehow I really did know/do know.