Disadvantages of Natural Family Planning
Fertility awareness-based methods may not work for you if you
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have more than one sex partner
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have a sex partner who isn't as committed to fertility awareness-based methods as you are
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don't want to keep close track of your safe days
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are not able to abstain or use another method for at least 10 unsafe days during each cycle
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take medicine that may affect reading the signs of these methods
Do not depend on tracking your fertility if you
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have irregular periods
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have a partner who is not cooperative
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have a sexually transmitted infection or frequent abnormal vaginal discharges
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cannot keep careful records
It may be more difficult to track your fertility if you are breastfeeding, are a teenager, or are getting close to menopause. The hormone shifts may make the signs unpredictable.
Don't switch to a fertility awareness-based method after using a hormonal one, such as the pill. The hormones will affect your cycle. Use a method without hormones while you're learning to track your fertility.