A free app for Android, by Veev Apps.

My Calendar is a period and ovulation tracker app that helps you predict your menstrual cycle. It’s the best way to keep track of your fertility and to find out when you’re most fertile and when you’re not. You can also use it to find out if you’re pregnant. The best thing is that the app is very easy to use, and you don’t have to do anything special to use it. It’s designed to work for any woman, and it works for all women with different menstrual cycles.