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The basal body temperature method - a fertility awareness-based method - is a type of natural family planning. Your basal body temperature is your temperature when you're fully at rest. Ovulation may cause a slight increase in basal body temperature.

You'll be most fertile during the two to three days before your temperature rises. By tracking your basal body temperature each day, you may be able to 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 basal body temperature method to determine the best days to have sex. Similarly, if you're hoping to avoid pregnancy, you can use the basal body temperature method to help determine which days to avoid unprotected sex. Because the basal body temperature method alone doesn't provide enough warning time to effectively prevent pregnancy, it's generally used in combination with other fertility awareness-based methods if you're hoping to avoid pregnancy.

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.