76-88% effective. Fertility awareness methods, also known as Natural family planning are ways to track your ovulation so you can prevent pregnancy.

In order to use FAMs, you’ve got to learn a lot about your menstrual cycle. You have to know when you’re ovulating and fertile, and when it’s safe for you to have sex without risking pregnancy.

There are a few different FAMs that help you track your fertility signs. You can use 1 or more of these methods to predict when you’ll ovulate:

• The Temperature Method: you take your temperature in the morning every day before you get out of bed.
• The Cervical Mucus Method: you check your cervical mucus (vaginal discharge) every day.
• The Calendar Method: you chart your menstrual cycle on a calendar.