Gynecologists believe the period between two menses at the middle of the menstrual cycle (Knaus-Ogino calendar method) is the best time to conceive. This is when a mature ovum leaves the ovary and travels through the Fallopian tube to the uterus, where it implants itself in the thickened uterine lining and waits for fertilization. If the ovum is not fertilized, both it and the uterine tissue break down and are discharged from the uterus as monthly bleeding.
It has been discovered and confirmed* that conception occurs in about 15% of cases during the middle of the menstrual cycle (the 15th day after the first day of menstrual bleeding). The menstrual calendar method, which indicates that a woman is most fertile in the middle of her cycle, is rather unreliable and fails to take irregular menstrual cycles into consideration because fertile periods are only determined on the basis of theoretical calculations.
Many gynecologists and scientists have long believed that conception cannot occur at other times. Nowadays, scientists and doctors hypothesize that conception can take place anytime in the menstrual cycle – that is during menses – and assert that ovulation/fertile days can occur anytime in your period, even more than once during one menstrual cycle. This means ovulation days come at intervals not only dependent on the menstrual cycle and the ovulation moment can happen multiple times per month. This hypothesis has been proven to be accurate by Dr. Jonas in his method tested over a 50-year time period *
* Research and statistical methods from Dr. Jonas between 1956-1999