Yes, fertility biomarkers’ occurrence and prevalence change during the peri-menopausal phase of a woman’s reproductive life. There are NFP courses offered specifically for the peri-menopausal woman. They focus on managing the variability of cycle lengths allowing for continued use of periodic abstinence until the woman enters menopause and her natural cycles cease. Plus, we encourage you to share what is learned about chastity, charting, periodic abstinence with your children and grandchildren.