Relying on that app may not be the best idea; from the article: >While the apps also can be used to track ovulation, signaling the days the user is more or les

Relying on that app may not be the best idea; from the article: >While the apps also can be used to track ovulation, signaling the days the user is more or less likely to become pregnant, most period tracker apps explicitly warn users not to rely on them to prevent pregnancy. The ovulation tracker and fertility prediction can be helpful for a woman trying to conceive, but it can give a false sense of security to a woman who relies on the app as a form of birth control. >That’s because even the most vigilant ovulation tracking methods have shockingly high failure rates, according to the American College of Obstetricians and Gynecologists, with up to one in four women becoming pregnant over the course of a year with typical use. >“Apps are a tool; they’re not actually a birth control method,” said Hannah Ransom of San Diego, a certified fertility awareness educator.