Behold the Wonders of the Cervix

The Behaviour of the Cervix over the Phases of the Ovulatory Cycle

The Discovery of Different Types of Cervical Mucus and the Billings Ovulation Method

There are several methods of tracking your fertility that exist, the newer methods are actually more sophisticated than just counting days as in the Rhythm Method. Now we have charts, and even software to help us track our cycles and fertility patterns.

The ones I know of include:

Billings Method -- pioneered by Dr Evelyn Billings and promoted in the US by Billings Ovulation Method Association - USA

Fertility Awareness Method -- as described in Taking Charge of Your Fertility by Toni Weschler and incorporated into the Ovusoft/TCOYF ovulation calendar software

Creighton Model Fertility Care System -- promoted by Fertility Care Centers and the Pope Paul VI Institute and referenced in this article "Infertility Care and the Role of the Compounding Pharmacist" (PDF)