A free app for Android, by Gülşah Doğan.

PERIOD CALENDAR AND OVULATION is an application that will help women keep track of their menstrual cycle and other health data, like temperature, weight, PMS symptoms, blood flow, and moods.

You can enter the date of the first day of your last menstrual period and the date of the first day of the current cycle. You can also add data about other symptoms, like headache, fatigue, moodiness, and stomachache. 

In addition, PERIOD CALENDAR AND OVULATION offers a backup-and-restore function and custom notifications. With this app, you can become more cognizant of your menstrual and reproductive health.