Fertility and cycle tracking apps are widely used and can be useful tools that help people monitor their health. But reports regularly show that, like other health apps, they fall short when it comes to protecting user privacy. That shortfall is particularly concerning for users in the US after a leaked Supreme Court opinion indicated that the court intends to overturn Roe v. Wade — eliminating the right to an abortion in the United States and allowing states to criminalize the safe and lifesaving medical procedure.