It is a method of targeting the most fertile time to get pregnant and is also used as a natural birth control without drugs or devices.
Natural Family Planning, Fertility Awareness
The Creighton Model for Natural Family Planning – Easy@Home Fertility
Using Ovulation Tests for Family Planning – Natalist
Archdiocese of Saint Boniface - Natural Family Planning
Easy@Home 25 Ovulation & 10 Pregnancy Test Strips Kit: Accurate
Natural Family Planning Natural family planning, Family planning, Fertility awareness method
cf.ltkcdn.net/pregnancy/your-pregnancy-journey/ima
Why Am I Getting White Discharge Before My Period - Catalog Library
The Ovulation Method Family of the Americas