My Period Tracker / Calendar

My Period Tracker / Calendar uses an improved Standard Days Method, which has a method failure rate of < 5% per year. The symptoms-based method has a method failure rate of 2% per year. But users need to track basal body temperatures and cervical mucus every day at particular hour. Since irregular sleep can interfere with the accuracy of basal body temperatures, women who sleep late at night may not get desired prediction results from these methods.

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