Good Lord.
I had a discussion with my coworkers while we were back @ the gas station once upon a time b/c one guy inserted his foot in his mouth in such a way. I said, essentially "Unless the woman is *giving birth* you do not ask if she is pregnant etc. You *do not ask* when it is due. God *help* you if you say 'congratulations' and congratulations are *not* in order. Unless you know her well, do *not* ask about the baby's daddy."