By Mayo Clinic Staff
The cervical mucus method, also called the ovulation method and the Billings ovulation method, is a type of natural family planning also known as fertility awareness-based methods.
The cervical mucus method is based on careful observation of mucus patterns during the course of your menstrual cycle. Before ovulation, cervical secretions change — creating an environment that helps sperm travel through the cervix, uterus and fallopian tubes to the egg. By recognizing the changing characteristics of your cervical mucus, you can predict when you'll ovulate. In turn, this may help you determine when you're most likely to conceive.
If you're hoping to get pregnant, you can use the cervical mucus method to determine the best days to have sex. Similarly, if you're hoping to avoid pregnancy, you can use the cervical mucus method to determine which days to avoid unprotected sex.
Using the cervical mucus method for birth control requires motivation and diligence. If you don't want to conceive, you and your partner must avoid having sex or use a barrier method of contraception during your fertile days each month.
The cervical mucus method can be used as a way to identify fertile times to help you gauge the best days to have or avoid unprotected sex. Tracking your cervical mucus for either fertility or contraception is inexpensive and doesn't have any side effects. Some women choose to use the cervical mucus method for religious reasons.
The cervical mucus method is sometimes combined with another method of natural family planning, such as tracking basal body temperature. This is sometimes referred to as the symptothermal method.
Using the cervical mucus method to promote fertility doesn't pose any risks.
Likewise, using the cervical mucus method for birth control doesn't pose any direct risks, but it doesn't offer protection from sexually transmitted infections. In addition, the risk of unintended pregnancy with the cervical mucus method is somewhat higher than with other methods of birth control.
As many as 23 out of 100 women practicing the cervical mucus method for birth control will get pregnant in the first year of typical use. But, with correct use, the pregnancy rate may be as low as 3 out of 100 women a year using the cervical mucus method for birth control.
Formal training is usually required to master the cervical mucus method. This method also necessitates ongoing, rigorous daily monitoring. In addition, abstinence — or use of another type of contraception — is typically needed for 10 to 17 days of each cycle.
To use the cervical mucus method, it's important to understand how cervical secretions change during a typical menstrual cycle. Generally, you'll have:
- No noticeable cervical secretions for three to four days after your period ends
- Scanty, cloudy and sticky secretions for the next three to five days
- Abundant, clear and wet secretions for the next three to four days — the period before and during ovulation
- No noticeable cervical secretions for 11 to 14 days until your next period begins
Although the specific length of these phases may vary, contact your health care provider if your cervical secretions don't follow this general pattern. You may have an infection that requires medical attention.
If you want to use the cervical mucus method for birth control, consult your health care provider first if:
- You recently had your first period, gave birth, or stopped taking birth control pills or other hormonal contraceptives
- You're breast-feeding
- You're approaching menopause
- You have a condition that disrupts regular ovulation, such as polycystic ovary syndrome
Your health care provider may discourage use of the cervical mucus method if you have persistent reproductive tract infections.
To use the cervical mucus method:
- Record your cervical secretions for several cycles. Starting the day after your menstrual bleeding stops, observe and record your cervical secretions on a daily chart. To avoid confusing cervical secretions with semen or normal sexual lubrication, avoid sex or use a barrier method of contraception during your first cycle. Also avoid douching, which can wash out cervical secretions and make it difficult to notice changes.
- Check your cervical secretions before and after urinating. Wipe — front to back — with toilet tissue. Record the color (yellow, white, clear or cloudy), consistency (thick, sticky or stretchy) and feel (dry, wet or slippery) of your secretions. Also note sensations of dryness, moistness or wetness in your vulva.
Plan sex carefully during fertile days. You're most fertile when your cervical secretions are abundant, clear, stretchy, wet and slippery — much like a raw egg white. If you're hoping to get pregnant, this is the time to have sex. Ovulation most likely occurs during or one day after your last day of this type of cervical secretion — known as your peak day.
If you're hoping to avoid pregnancy, unprotected sex is off-limits from the day your cervical secretions begin until four days after your peak day. If you have sex before your cervical secretions begin, you may want to avoid sex the next day and night so that you don't confuse semen and arousal fluids with cervical secretions.
Some health care providers also recommend avoiding unprotected sex or using a barrier method of contraception during your period because it's difficult to detect cervical secretions when they're mixed with menstrual blood.
Interpreting and charting cervical secretions can be challenging. Most women need more than one instructional session to recognize the pattern of secretions in a typical menstrual cycle. Consult your health care provider with any questions or concerns.
Oct. 31, 2014
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- Pfenninger JL, et al., eds. Pfenninger and Fowler's Procedures for Primary Care. 3rd ed. Philadelphia, Pa.: Mosby Elsevier; 2011. http://www.clinicalkey.com. Accessed Aug. 19, 2014.