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Definition of NFP

Philosophy of NFP

How NFP works

Reproductive anatomy and physiology

Phases of the menstrual cycle

Summary facts on hormones, fertility and pregnancy

Efficacy of the Marquette
Method of NFP

Summary of Female Hormones
and Their Functions

Estrogen: Secreted
by follicle:
  • Stimulates cervical mucus production
  • Stimulates lining of uterus to grow

FSH and LH

  • Stimulates ovulation
  • Heats up female body temperature
  • Dries cervical mucus
  • Supports and nourishes lining of uterus

Summary Facts
on Fertility:

There are a number of biological facts that have been discovered in the past century that are necessary to understand how NFP works.  They are as follows:

  • A woman ovulates only one day in each cycle.
  • An egg lives only 12 to 24 hours.
  • Sperm need good mucus to survive.
  • Sperm will live 3-5 days in good mucus.
  • Sperm will die within hours or minutes when not in good mucus.
  • A man and woman together are only fertile for 6 days.

Factors necessary
for pregnancy:

  1. Satisfactory ovulation
  2. Healthy and open fallopian tubes
  3. Healthy endometrium for implantation
  4. Healthy cervix with adequate cervical mucus
  5. Healthy and adequate sperm
  6. Mutual and supportive relationship between the husband and wife is helpful

This Site was made possible
by a generous donation from
Our Sunday Visitor Institute
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