Helping You Monitor Your Fertility

Recommended Pages for Further Reading


"Fertility Monitors can help identify the start and end of the fertile window by testing for two hormones in daily urine samples."


Ovulation Calendar

The Cervical Mucus Method tracks cervical mucus and applies some basic interpretation rules to understand fertility based upon the observed mucus. It is very important that you understand how to make observations and classify cervical mucus for this method to be effective.

Cervical Mucus Method

  • Rule #1 - Abstain from intercourse during the days of heavy bleeding during menstruation.
    Menstrual bleeding obscures mucus.
  • Rule #2 - During days exhibiting the basic infertile pattern (BIP), have relations only in the night and not on successive nights.
    Waiting until evening allows time to make mucus observations throughout the course of the day. It is important not to have intercourse two days in a row because seminal fluid can obscure mucus observations on the day following intercourse. Abstaining the next day allows time for the seminal fluid to dissipate and to reconfirm the continued existence of the basic infertile pattern.
  • Rule #3 - Abstain from intercourse on any days with discharge or bleeding that deviate from the BIP. Change (dryness to wetness or bleeding) indicates a break from the basic infertile pattern. Intercourse should be avoided until the basic infertile pattern establishes itself again for 4 consecutive days. Intercourse can resume on the evening of the fourth day.
    This allows time to recognize the possible occurence of the peak day. Avoiding intercourse during this fertile period and the days that follow it help to avoid possible conception.
  • Rule #4 - After the peak day has been identified, abstain from intercourse for 4 days and 3 nights. Intercourse can resume on the evening of the 4th night. Intercourse is permitted on all remaining days of the cycle (day or night) after the fourth night.
    Ovulation occurs on the peak day (or possibly 1 or 2 days after). It is important to wait this long and another day to account for the lifespan of the egg.

Rule #4 can only be applied if the cycle does not have any special circumstances. If the cycle follows a pregnancy (postpartum), breast feeding, weaning, constant wetness, infections, coming off of birth control medicine, pre-menopause, stress, etc. then special circumstances apply. Only rules #1 through #3 can be used.

Cervical Mucus Method

Example of a CMM Chart from