The statistical method known as Ogino-Knaus is one of the most reliable when it comes to the study of fertile days.
NoBaby bases its operation on it, so its download is highly recommended if you want to calculate both the days in which the risk of pregnancy is practically null and those in which the odds are maximum.
It should be noted that despite its high rate of success in statistical terms can fail on certain occasions, so NoBaby is not a 100% effective method to prevent unwanted pregnancies.
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