World Organization Ovulation
Method Billings
www.woomb.org

Woomb Canada
www.woomb.ca

Natural Family Planning Association
- Ontario
www.naturalfamilyplanning.ca

Billings P.E.I., Inc.
www.naturalfamily
planning.ca/pei

Teen Star International
TeenSTAR.org

Billings Ovulation Method Association - USA
www.boma-usa.org

Facts about fertility

Length of menstrual cycle

Observations, charting and
rules of BOM

Understanding the BOM

Achieving pregnancy

Postponing conception

BOM during breastfeeding

The circular diagram

Examples of charts