How do you know when you are the most fertile?

Answer 1

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: www.demographic-research.org/Volumes/Vol�

To be sure about your fertile and infertile days it is advisable to keep track of an ovulation calendar