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The probabilities oscillate throughout the cycle and are individual to each woman. If we speak about the 'average' woman, the probabilities of being in the fertile window for a woman with a 28 cycle are the following:

Day of the cycle / % of being in fertile window

Day 11 - 63%

Day 12 - 65%

Day 13 - 61%

Day 14 - 53%

Day 15 - 50%

These probabilities come from a study authored by Colombo, Masarotto (2000) and published in Demographic Research

To be sure about your fertile and infertile days it is advisable to keep track of an ovulation calendar (this is enhanced if you also keep track of your temperature and cervical mucus data). You can use it to conceive but also for natural family planning (to prevent conception). A good one is Ovuline -

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