My DD is 9. She's never expressed any interest in a sibling in fact she's mentioned that she doesn't really want one 
Regardless DH and I would like another child and after quite a long time TTC I am now 6 weeks pregnant. We've told our parents but otherwise plan to announce at Xmas when we see rest of the family.
My AIBU is to ask how you would advise we break the news to DD? I was thinking about booking a private early scan for 23rd December and taking her with us so she knows, and has time to process, before everyone else and if she's not thrilled the presents should detract from the disappointment of a new baby!
Disclaimer- I actually think that she'd make a marvellous big sister once baby is here but I do think the shock of a sibling after 9 years of being an only child with all our attention will need some getting over!