Confused

I’ve been seeing people in other groups of all ages like young teens and men. I’m not trying to be rude or anything but I thought this was like a <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a>? I know when I downloaded it it asked when I was due and everything before I could talk to people. And the app icon is a baby in the womb so I’m just wondering is there like a different name for an app that has the same community or something? Just curious because why would they download an app when they’re not pregnant? Sorry for my ignorance I’m not trying to be negative in anyway I’m honestly just curious