During this time of life, cycles may become more irregular - both shorter and longer. Because of this it is important to consider the days of menstruation to be possibly fertile. If a short cycle occurs, the cervical mucus flow may begin during the heavy flow days and be masked by the bleeding. Beyond that, it is important that there be good, consistent charting. Both the cervical mucus sign and temperature pattern provide valuable information about the fertile and infertile times. We offer free NFP During Menopause Refresher Classes for couples in this time of their reproductive lives.