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The fertility awareness method (FAM) is a natural family planning strategy that women can use to help prevent pregnancy. It involves tracking your natural cycle of fertility and your menstrual cycle, developing a better awareness of your body, and using a variety of non-pharmaceutical methods to detect ovulation.
The rhythm method is where your previous menstrual cycles are tracked on a calendar and this information is used to predict future ovulation dates. FAM combines the rhythm method with even more attention to the body to better predict ovulation and prevent pregnancy.
In the rhythm method and in FAM, you abstain from sex (periodic abstinence) during your most fertile days. Alternately, you can use backup contraception on your fertile days.
The effectiveness of FAM varies depending on the combination of tracking you use. There are many ways to prevent pregnancy that are more effective than a natural method. They involve medication or medical intervention.
FAM is one of the least reliable forms of pregnancy prevention. But FAM is an appropriate choice of birth control for some diligent and self-aware adult women.
If you’re a premenopausal adult woman, you’re most likely to be fertile and get pregnant if you have unprotected sex a few days before or during ovulation.
Ovulation happens when your ovaries release an egg. It occurs approximately once per month, about 12 to 16 days after menstruation. The specific day on which you ovulate depends on your cycle length. This is largely controlled by fluctuations in your sex hormone levels. For some women, these fluctuations are quite consistent from one month to another. Other women have more irregular menstrual cycles. A period occurs 14 days after ovulation if a pregnancy hasn’t occurred.
Once an egg is released from your ovaries, its life span is very short. Conception can only occur if it’s fertilized 24 to 48 hours after the time of actual ovulation. However, male sperm can remain alive and viable in your body for up to five days after ejaculation. So, it’s possible to have intercourse up to five days before you ovulate and get pregnant as a result.
These biologic realities mean the actual period of viable fertility can last anywhere from five to eight days for most women. In general, women are most fertile during the following times:
You’re less likely to get pregnant if you’ve accurately identified your fertile period and avoid unprotected sex on those days each month. In theory, this will prevent viable sperm from being present in your fallopian tubes at the same time as a viable egg. In turn, this will prevent fertilization and conception. That being said, fertility awareness is among the least reliable methods of contraception. Multiple methods of collecting information are necessary. Use the calendar method, the temperature method, and the cervical mucus methods to increase the effectiveness of FAM.
Every woman’s menstrual cycle is different. To use FAM effectively, it’s important to pinpoint when you’re ovulating. There are several ways to track your ovulation cycle and fertility. Using a combination of the following improves effectiveness in preventing pregnancy.
These are some common methods incorporated into fertility awareness:
The symptothermal method, in which you use all three of the methods above together, makes FAM most effective. You should track at least 6–12 menstrual cycles before you begin to rely on FAM for contraception.
It’s best to talk to your doctor or take a course on fertility awareness before deciding if FAM is right for you. Educate yourself about your body and its cycles. FAM requires a significant and consistent investment of time and effort.
The effectiveness of FAM depends on:
FAM can be effective for couples that always use it consistently and correctly. That can be hard to do. Among women who use FAM inconsistently or incorrectly, 24 out of 100 become pregnant each year, reports Planned Parenthood. That makes it one of the least reliable methods of non-abstinence-based birth control.
FAM has several advantages. For example, it:
Practicing FAM can also help you and your partner learn about fertility. This may help you get pregnant later on, if you so choose.
If you have irregular menstrual cycles, FAM is a poor choice for you. Talk to your doctor to learn more about birth control options.
Written by: the Healthline Editorial Team
Medically reviewed on: Mar 11, 2017: Debra Rose Wilson, PhD, MSN, RN, IBCLC, AHN-BC, CHT
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