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Ovulation calendar online - Calculate your periods and find out when you are most likely to get pregnant!
LoveCycles - LoveCycles is an easy and fun to use period tracker (menstrual cycle calendar).
Period Tracker - Period Tracker, the easiest way to track your periods!
Cycle - (taken from the man pages) DESCRIPTION
Periodic Calendar - What is Periodic Calendar?
Ovulation Calculator - Ovulation Calculator, Fertility Resources, and Facts on Pregnancy Tests and Ovulation Predictor Kits