It's become more and more common for a female to use an app on her phone to track her period. The most common users for these apps are teenagers. As these apps can become useful for most, it seems it has become a problem. Most apps provide you with an option of "trying to get pregnant" or "not trying to get pregnant" while even providing when you could possibly ovulate and your chances of pregnancy. Leaving girls age 11-17 to decide if they want to get pregnant.