Can I use fertility awareness methods if my periods are irregular or unpredictable?

To use fertility awareness methods you need to know your body’s signs of fertility. If you are counting the days of your cycle to prevent pregnancy, that method won’t work as well to prevent pregnancy if you have irregular periods (that means your menstrual cycle is less than 26 days or longer than 32 days).

Still not working?

It can be normal to have menstrual cycles that are between 21 and 35 days long, but fertility awareness methods will be less effective for you. Using the combination pill, patch, or ring can help regulate your periods.