Actually, you're one of the first persons to create a user group. This website is technically not launched to the public yet, although I know many of our users have already discovered it. But we are still in beta mode and have yet to work out the kinks of the site.
The user created groups are also not viewable on the mobile versions yet so that's the reason no one's joined yet. Once we update the mobile app to include showing user created groups, and once we officially launch the web version, the membership will jump up.
We welcome any feedback or questions you might have. Or if you have bug issues to report, let us know!
Good luck with your pregnancy!
Jennifer (Community Moderator)