Information about the fertile and infertile phases of the menstrual cycle provided by cycle charting allows the users of FABMs to time intercourse in order to achieve pregnancy. Identifying the fertile phase of the cycle accurately is especially valuable for people in situations where the fertile phase might be hard to identify (eg. very irregular cycles) or shorter than normal (eg. perimenopause). Additionally, charting the menstrual cycle can help identify factors that might reduce fertility and enable people to address health issues impairing their fertility even before they start trying to achieve a pregnancy.