Periodic Calendar by Maryan Rachynskyy
Periodic Calendar provides support for BBT and sympto-thermal methods which have the highest reliability in fertility periods prediction. User can choose any subset of the features to be used or even fall to the generic calendar method (which if used alone is very unreliable).
Periodic Calendar is a GUI utility which can be used to: track women menstrual cycles predict the fertile days when the probability to get pregnant is high predict the "safe" days when the probability to get pregnant is minimal predict the day of the next menstruations record the pregnancy calculate the pregnancy weeks predict the baby's birth date record the personal notes for any day
