A long menstrual cycle will occur when a woman ovulates later than usual in her menstrual cycle. This could happen in any cycle for many reasons, including stress, medications, or the natural changes of a maturing woman. In a long cycle, the biological markers of fertility, i.e., the peak day of cervical mucus, and the monitor peak will occur later in the cycle. The ClearBlue monitor is designed to monitor cycles up to 42 days in length. If you have cycles longer than 42 days, please consult with your NFP nurse for a special long cycle protocol. See instruction below for managing long cycles with cervical mucus monitoring.
(SeeExample Long Cycle Chart below)
Example of two long cycles within the first 6 cycles of charting with mucus:
Example of two long cycles with the second 6 cycles with the mucus sign: