How about:
I am having/had a boy and really wanted a boy
I am having/had a girl and really wanted a girl

It is a bit different to "happy with either gender" as it is about wanting one gender in particular without the disappointment. I know that you are looking for disappointment specifically but if I were pregnant, I might not be able to find an answer in the above poll that is appropriate for my situation with the above choices.

ETA: I was a little slow here, missed the above responses while I was typing