Well, good for you! I’m not pregnant, myself. I would have been alarmed if I were.
As a side note, if your other kid is 2.5, don’t assume that he doesn’t have an opinion. I wasn’t quite two when my brother was born, and I was severely pissed at my mom about it. I don’t remember it, of course, but I’ve heard stories. And I’m on good terms with my brother, by the way.
And of course, CONGRATULATIONS!
Yes, do start referring to her as your big girl and tell her that she’s going to have a little sibling.