I'm one of the people so-mentioned on this thread who would kill for a scan picture of my (useless, non child-bearing) womb with a baby in it.
That said, before I found out that I couldn't carry children, I definitely would have had a preference on the sex... I probably wouldn't have told anyone, because (as evidenced by this thread) it's very much frowned upon. And yes, being totally transparent, I may have had a moment's disappointment which I would have needed to have dealt with.
Obviously now, I wouldnt care - girl, boy, crocodile.... (ok I'd be a bit disappointed if it was a crocodile
) but just to experience being a mother (and all the good and bad that comes with that) would be a dream come true.
I wont chide the OP for her feelings. (And I'm also well aware that I don't speak for all of the infertile women - just me.) I would say, however, that this is something that does need to be worked through prior to having the baby, however you feel that's best. Either by finding out the sex or not. You dont want to miss a moment's joy on the day you bring that sweet child into the world to love and parent.
Congratulations on your little miracle, OP.