Fertility awareness is a way to prevent pregnancy by not having sex around the time of ovulation (the release of an egg during a girl's monthly cycle). Couples who do want to have a baby can also use this method to have sex during the time that they are most likely to conceive. Fertility awareness can include methods such as natural family planning, periodic abstinence, and the rhythm method.
If a couple doesn't have sex around the time of ovulation, the girl is less likely to get pregnant. The trick is knowing when ovulation happens. Couples use a calendar, a thermometer to measure body temperature, the thickness of cervical mucus, or a kit that tests for ovulation. The ovulation kits are more useful for couples who are trying to get pregnant. The fertile period around ovulation lasts 6 to 9 days and during this time the couple using only fertility awareness for birth control who does not want to get pregnant should not have sex.
Fertility awareness is not a reliable way to prevent pregnancy for most teens. Over the course of 1 year, as many as 25 out of 100 typical couples who rely on fertility awareness to prevent pregnancy will have an accidental pregnancy. Of course, this is an average figure, and the chance of getting pregnant depends on whether a couple uses one or more of the fertility awareness methods correctly and consistently and does not have unprotected sex during the fertile period.
In general, how well each type of birth control method works depends on a lot of things. These include whether a person has any health conditions, is taking any medications that might interfere with its use, whether the method chosen is convenient — and whether it is used correctly all the time. In the case of fertility awareness, it also depends on how consistent a woman's ovulatory cycle is, how accurately a couple keeps track of when she could be ovulating, and how reliably unprotected sex is avoided during the fertile period.
Abstinence (not having sex) is the only method that always prevents pregnancy and STDs.
Fertility awareness is not a reliable way to prevent pregnancy for most teens. It is often very difficult to tell when a girl is fertile. Because teens often have irregular menstrual cycles, it makes predicting ovulation much more difficult. Even people who have previously had regular cycles can have irregular timing of ovulation when factors such as stress or illness are involved. Fertility awareness also requires a commitment to monitoring body changes, keeping daily records, and above all not having sex during the fertile period.
For couples interested in this method, it is best to talk to a doctor or counselor who is trained in fertility awareness. He or she can then teach the couple the skills they need to know to practice this birth control method accurately.
The tools needed for fertility awareness — such as ovulation detection kits and thermometers, for example — are available in drugstores. But they can be expensive. Again, it's best to talk to a doctor for advice on using this method.
Reviewed by: Mary L. Gavin, MD
Date reviewed: October 2013
|Planned Parenthood Info for Teens This site from the Planned Parenthood Federation of America has information on relationships and sexual health for teens.|
|National Campaign to Prevent Teen and Unplanned Pregnancy This site provides teen pregnancy facts, resources, and prevention tips.|
|Planned Parenthood Federation of America Planned Parenthood offers information on sexually transmitted diseases, birth control methods, and other issues of sexual health.|
|American College of Obstetricians and Gynecologists (ACOG) This site offers information on numerous health issues. The women's health section includes readings on pregnancy, labor, delivery, postpartum care, breast health, menopause, contraception, and more.|
|Gyn Checkups Girls should get their first gynecological checkup between ages 13 and 15. Find out what happens during a yearly gyn visit -- and why most girls don't get internal exams.|
|Female Reproductive System Why do girls get periods? What goes on when a woman gets pregnant? What can go wrong with the female reproductive system? Find the answers to these questions and more in this article for teens.|
|Abstinence Abstinence is the only form of birth control that is 100% effective in preventing pregnancy. Abstinence also protects people against STDs.|
|About Birth Control Before you consider having sex, you need to know how to protect yourself. Read this article to get the basics on birth control.|
|Birth Control Methods: How Well Do They Work? Some birth control methods work better than others. This chart compares how well different birth control methods work.|
|What Can I Expect From the Gynecologist? Find out what the experts have to say.|
|When Is it Time to Start Seeing a Gynecologist? Find out what the experts have to say.|
|About Sexually Transmitted Diseases (STDs) You've probably heard lots of discouraging news about sexually transmitted diseases. The good news is that STDs can be prevented. Find out how to protect yourself.|
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