Using Google reverse image search, all that comes up is a couple posts on the Escapist from April 6 2011, claiming it's concept art from Valve.
Certainly looks like concept art. But if it's really from valve, and it's been this long, chances of us seeing anything from it or even getting any new info on it are incredibly small.
I'd like more games to feature pregnancy as just a normal part of the world though. I get why it doesn't really show up in most RPG or FPS worlds, but it would be nice.