PERIMON will be discontinued on June, 30th 2015

Cervical Mucus Method

The mucus method named after the doctors Evelyn and John Billings helps to determine the time of ovulation. Used solely it can be quite unsafe. Yet in combination with other methods (e.g. PERIMON or the temperature reading) it gives an good complement. Billings distinguishes the following phases:
Cervical mucus during ovulation, from:
  • Phase 1: Directly after the menstruation the vagina is dry. A low oestrogen level keeps mucus production low.
  • Phase 2: Before the ovulation the mucus gets sticky.
  • Phase 3: During the ovulation is the wettest time of the vagina. The cervical mucus is viscid and bright and it is often possible to spin threads between two fingers that are one to three centimeters long (see opposite picture). This phase lasts 2-3 days and is the most fertile.
  • Phase 4: After ovulation the amount of mucus decreases.
  • Phase 5: Before the next bleeding the vagina gets dry again. The mucus gets clear and sometimes even watery.
During ovulation the cervical mucus gets thicker and spinnable. It can be drawn to thread a one to three centimeters long before it tears. If you contracept, the fertile period ends with the morning of the fourth day after the peak day, whereas the peak day means the day with the best quality of the mucus (Natürliche Familienplanung heute, p. 119).
In ca. 7% of the cycles two or more peak days can be observed (Natürliche Familienplanung heute, p. 56); it is therefore advisable to double-check (e.g. by additionally examining the cervix) before assuming to be infertile. Alternatively increasing the safety period after the peak day from four to seven days causes clearly better results, because you will notice it early enough if a second peak day approaches.
It is best to check the mucus consistency in the evening, but never after intercourse, because sperm and sexual arousal changes the consistency. Also a bacterial infection can change the consistency of the mucus so that a clear interpretation will be impossible, which is another reason to additionally check the cervix. – Any liability for the information on this page or its correctness is excluded. (last updated: 03/23/2015)
Other methods are the examination of the cervix and the temperature method. (Image from:
March | 29

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