A woman is said to have irregular cycles when the difference between her shortest and longest cycle (during one year) is more than 6 days. How long it takes for a woman’s body to prepare for ovulation varies, and it is the variation of this pre-ovulatory phase that determines the cycle length. Ovulation occurs sooner (creating a short cycle) or later (creating a long cycle) depending on stress, season, emotions, nutrition, health, and other factors.
Since the Sympto-Thermal Method does not rely on cycle length, but rather on simple observations and interpretations of the body’s fertility signs, a woman who experiences irregular cycles can still use the Sympto-Thermal Method. Sooner or later, fertility signs will appear and indicate that ovulation may soon occur.
The Sympto-Thermal Method helps the couple to understand each and every cycle as it unfolds. So by using the Sympto-Thermal Method, a couple can follow the method quite effectively even if the woman’s cycles are irregular.