With any method of NFP, the couple tracks signs that the woman's body naturally produces throughout the monthly menstrual cycle. This information is recorded and used to guide the couple in identifying the days when pregnancy is possible. These days are called the "fertile window." Once the fertile window has been identified, the couple can change their behaviors during that time to avoid or achieve pregnancy.

It's a myth that only women with regular cycles can use natural family planning! Since each cycle is tracked individually, even women with irregular cycles or women who are approaching menopause can determine the fertile window confidently. Additionally, the Marquette Method is the only method of NFP to demonstrate high effectiveness for breastfeeding women who were avoiding pregnancy during the postpartum time.

The Marquette Method uses two main indicators to determine fertility: cervical mucus observations and urinary hormone measurements. One or both signs are tracked based on user preference, and then combined with a simple protocol to determine the fertile window. The Marquette Method has optional instructions for incorporating basal body temperature (BBT), urine luteinizing hormone (LH) tests, urine progesterone tests, and the Mira monitor to help be more precise in identifying fertility. 

In addition to using the Marquette Method to effectively avoid or achieve pregnancy, there are health benefits to charting your cycle. Some common women's health issues, such as endometriosis, PCOS, and PMDD can be identified through tracking signs of fertility on a chart, and a Marquette Method healthcare professional can guide women on next steps to care for their health. Couples will also learn how to grow in communication and the mutual love for each other that is integral to NFP.