Ever heard of Lunar fertility? It’s a very interesting concept. The lunar fertility cycle works on the premise that you can be fertile during your menstrual cycle when the moon is in the same phase it was when you were born, and therefore more than one time in the month. The following is an excerpt from http://www.epigee.org
The theory of lunar phase fertility is generally credited to Dr. Eugene Jonas. In the 1950s, Dr. Jonas tried to find an explanation as to why so many women became pregnant despite faithfully practicing the rhythm method. The fact that these women were becoming pregnant at a time when they weren’t suppose to be fertile lead Dr. Jonas to reason that maybe women had more than one fertile period during a month. Since Dr. Jonas was very much into astrology, and since the original ways of charting a woman’s period were based on the lunar cycles, he turned his attention heaven ward.
Womens periods are our ‘moontime’, our rhythmic, cyclical connection to ourselves. We have been connected to the moon since time began……plausible and worth a read!.