In the example above, your fertile period is from day 8 to day 20, so protect yourself from becoming pregnant for these 12 days of your cycle. If you do not want to get pregnant, do not have sex-or be sure to use another method of birth control-for 1 week before your first fertile day.If you want to get pregnant, have sex every day or every other day from your first fertile day to your last fertile day.Sperm can live in your vagina 3 to 5 days after sex. Your last fertile day would then be the 20th day after menstrual bleeding begins. For example, if your longest menstrual cycle lasts 31 days, you would subtract 11 from 31 to get 20. Your last fertile day should be that many days after your menstrual bleeding starts. To find the last day that you are likely to be fertile, subtract 11 from the number of days in your longest menstrual cycle. Your first fertile day would then be the 8th day after menstrual bleeding begins. For example, if your shortest menstrual cycle is 26 days long, you would subtract 18 from 26 to get 8. Your first fertile day should be that many days after your menstrual bleeding starts. To find the first day that you are likely to be fertile, take away (subtract) 18 from the number of days in your shortest menstrual cycle. If your cycle is regular and about 28 days long, you are most likely to ovulate 14 to 15 days after menstrual bleeding begins. See if your menstrual cycle is regular and how many days it is. Write down the dates of your menstrual periods for 6 to 8 months. They include the calendar (rhythm) method, the basal body temperature (BBT) method, and the cervical mucus method (Billings method).įor fertility awareness to work well, it's best to use all of the following methods together. There are several basic methods to find the time of ovulation. But this method can be very helpful to time when to have sex to become pregnant. The number of unplanned pregnancies is 24 out of 100 women who typically use fertility awareness. So you must prepare each month, be familiar with your body changes, and talk with your partner about your cycle.įertility awareness is not the most effective way to prevent a pregnancy. Other methods include diaphragms and condoms. So it's possible to become pregnant if you have sex 5 days before you ovulate.įor fertility awareness to be used as birth control, either you must not have sex or you must use another method of birth control for 8 to 16 days of every menstrual cycle. Sperm can live for 3 to 5 days in a woman's reproductive tract. So ovulation would occur on about day 10 of a 24-day menstrual cycle, day 14 of a 28-day cycle, and day 21 of a 35-day cycle. On average, ovulation occurs 12 to 16 days before the menstrual period begins. This includes the day of ovulation and the 5 days before it. You can then time sexual intercourse to try to become pregnant or to try to avoid pregnancy.Ī woman is most often able to get pregnant for about 6 days each month. (It's also called natural family planning or periodic abstinence.) Learning about these changes can help you know when you ovulate. Obstetrics and Gynecology 100(6): 1,333-1,341.Fertility awareness is a way to check the changes your body goes through during your menstrual cycle. Timing intercourse to achieve pregnancy: Current evidence. What's the cervical mucus method of FAMs?. American College of Obstetricians and Gynecologists. Fertility awareness-based methods of family planning. Learn more about our editorial and medical review policies.ĪCOG. We believe you should always know the source of the information you're seeing. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. Bab圜enter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world.
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