What kind of app is this?!

Don't yell at me. This is a legit question. ISN'T THIS AN ovulation app?! I could be wrong. But I'm an adult woman trying to conceive and I'm looking through these groups for other woman going through the same things. Like why am I seeing these teenagers practicing abstinence (But that is great! Good for you! You go girls!!!!) And picture from proms. I'm a little confused? Can someone fill in the clueless lady?!