Point of Change (POC)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 14, 2026

The Point of Change (POC) is the cycle day when a woman's Base Infertile Pattern is broken for the first time: discharge changes in character, sensation shifts, and the fertile window opens.¹

In the Billings Ovulation Method, the POC functions as the equivalent of the first day of fertile-type mucus in a standard cycle. The departure from the BIP does not need to be dramatic. Any change in sensation or appearance, even a subtle one, qualifies. The rule is departure from sameness, not the appearance of a specific mucus type. From the POC forward, the woman treats each day as potentially fertile until her infertile pattern is re-established.

The POC is especially important for women whose cycles do not follow a predictable pattern, including those who are postpartum, breastfeeding, perimenopausal, or whose cycles have been disrupted by suppressive medications. In these populations, a fixed fertile-window rule does not apply. The POC gives the fertile window a reliable starting point anchored to that individual woman's baseline, not to population averages.

Identifying the POC correctly depends on a well-established BIP documented across prior consecutive days. Instruction from a trained practitioner is required before applying this rule in clinical or family-planning practice. The POC connects directly to the pre-Peak phase and precedes the Peak Symptom by a variable number of days depending on the individual cycle.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.