Natural Family Planning

Avoiding or Achieving Pregnancy - Natural Family Planning, or NFP, is a method of birth regulation that is consistent with Catholic marriage vows by which a couple recognizes the natural, biological signs of fertility and infertility. To avoid pregnancy, the couple abstains from genital contact during times of fertility. To achieve pregnancy, the couple uses times of fertility for intercourse.

Resources and Information
Endorsed Presentations
Marquette Model

The Marquette Method is a form of Natural Family Planning: a chemical-free and researched way to avoid or achieve pregnancy. It includes the optional use of the Clearblue fertility monitor, and can be combined with other indicators of fertility, such as cervical mucus observations or temperature measurements to meet reproductive goals.

The Marquette Method is especially useful for couples who are post-partum and breastfeeding.
Classes are taught online and in-person. Registration is required. Please contact the instructor for schedules & pricing.

Contact: Lauren Vitale, BSN, RN
(313) 969-5802

Sympto-Thermal Method Contact: Couple to Couple League

Determining a woman's time of fertility by correlating three signs of fertility: cervical mucus, temperature rise and cervical changes

Colleen and Mark Pressprich:

Planeacion Natural de la Familia

To register for classes:

El Método de la Ovulación

Contact: (313)570-7812

Se habla Español.

Creighton Model FertilityCare System

Determines a woman’s time of fertility using standardized observations of cervical mucus. Creighton Model can be used both to achieve and avoid pregnancy. In cooperation with NaPro TECHNOLOGY®, the Creighton Model assists in the identification and treatment of various reproductive and gynecologic health issues. Learning takes place in a series of private follow-ups after an Introductory Session has been attended.


San Juanita Lopez (instruction in English and Spanish)

(313) 363-8956

FertilityCare Services of Plymouth
Frequently Asked Questions
Go to Knowledge Base
What is Natural Family Planning (NFP)?

Natural family planning (NFP) is a way of avoiding or achieving a pregnancy without the use of drugs or devices. NFP is a way of life in which a couple recognizes their days of fertility and infertility, and together they decide if they will engage in conjugal love or abstain. There are many variations of NFP methods that can be placed under five broad categories: Sympto-Thermal, Mucus, Sympto-Hormonal, Temperature, and Rhythm.

The Sympto-Thermal Methods (1950s) are based on the changes in three physical signs experienced by the woman: cervical mucus, temperature and the position, texture, and opening/closing of the cervix.

The Mucus Methods (1960s) are based on the recognition of a specific type of cervical mucus present before ovulation and experienced at the vulva. Pregnancy cannot occur without fertile mucus. In addition to this primary sign of fertility, clients learn to recognize other external signs of fertility.

The Sympto Hormonal Methods (1990s) are based on the detection of specific levels of reproductive hormones utilizing a fertility monitor (or other device) alone or in conjunction with another sign of fertility such as mucus or temperature.

The Temperature Method (1940s) is based on the medical fact that a rise of the woman's basal body temperature (BBT) occurs a few days before or after ovulation.

Rhythm (1930s) is the oldest known NFP method. It is based on the fact that menstruation occurs about fourteen days after ovulation. Rhythm is based on a woman's history of past regular cycles. Rhythm is 75 to 85% effective in avoiding a pregnancy. There are several versions of the Rhythm Method suggesting different numbers for calculating the fertile time of the cycle. The Rhythm Method is effective when cycles are consistently regular.

The Sympto-Thermal, Mucus, Sympto-Hormonal and Temperature NFP methods are up to 99% method effective in avoiding a pregnancy and are based on signs of fertility and infertility that occur on a daily basis in the present cycle–not in past cycles. The Rhythm method is 75-85% effective in avoiding a pregnancy as it relies on predicting the fertile time of a cycle assuming the current and future cycles will be the same as past cycles.

How effective is NFP?

Other than Rhythm, NFP is 96% - 99% method effective in avoiding a pregnancy. NFP is up to 99% method successful in spacing or limiting pregnancy when couples understand the method, are motivated to follow the method, and are taught by competent teachers. Archdiocese of Detroit NFP teachers are certified according to the Standards for Diocesan Natural Family Planning Ministry with a program of the committee for Pro-Life Activities with the United States Conference of Catholic Bishops.

It is necessary for couples to carefully follow the rules of the NFP method to achieve their family planning intention. Those who are strongly motivated to avoid pregnancy, and who follow the method strictly, find NFP very effective.

What are the similarities and difference between the Ovulation Method, Creighton Model FertilityCare and Sympto-Thermal Method?

All are methods accepted by the Catholic Church as valid natural family planning methods. All have method effectiveness rates of up to 99% for avoiding a pregnancy. All methods observe the primary sign of fertility, cervical mucus. All methods require charting and abstaining from conjugal love during the fertile time in the woman's cycle to avoid pregnancy.

Although the Ovulation Method teaches several external signs of fertility, it focuses on one major sign of fertility, cervical mucus as experienced at the vulva. Creighton Model FertilityCare teaches observation of the cervical mucus using a standardized descriptive model and works to identify biomarkers that can help diagnose and treat various reproductive disorders & infertility. The Sympto-Thermal Method correlates information from three signs of fertility: temperature, mucus and cervical changes as experienced at the cervix.

Differences between the the methods lie in the interpretation of the signs of fertility, and in the way ovulation is determined.

How does a person register for Natural Family Planning classes?

Register for a class by visiting the website or contacting the teacher listed to inquire about the fee, the class schedule and registration requirements.

Is NFP complicated to learn and use?

Couples with little or no education use NFP successfully. The NFP methods are so simple that they are successfully used by couples of various cultures and educational backgrounds all around the world. (Kambic and Gray, Human Reproduction, 1988, p. 693). The blind use NFP effectively. During the NFP classes, couples are taught to recognize signs of fertility and infertility. With some NFP methods couples are also taught to read, record, and interpret temperatures.

Can I learn NFP from information on the Internet or in books?

Some NFP organizations and methods offer online or distance learning.

The best way to accurately learn an NFP method is to take classes with a competent, certified teacher. At classes, teachers can answer questions and clarify confusing information. Individual chart reviews can also be scheduled to help correct any misunderstanding or to reassure a couple that it is correctly applying the information & guidelines for the method.

Can NFP be used only by women with regular cycles?

NFP can be used by any woman regardless of the length or variations in her cycle. NFP is effective with menstrual cycles of any length and any degree of irregularity such as during breastfeeding, pre-menopause, and other special circumstances. Modern NFP methods monitor the current, day-to-day signs of fertility and/or infertility. These body signs are specific and observable.

NFP allows a woman to understand her body's physical signals telling her when she is most likely to become pregnant. Knowing this, she and her spouse can effectively avoid or achieve a pregnancy.

Who marries the couple?

"In the Latin Church…spouses, as ministers of Christ's grace, mutually confer upon each other the sacrament of Matrimony by expressing their consent before the Church." CCC1623

What makes marriage in the Catholic Church a Sacrament?

"Marriage helps to overcome self-absorption, egoism, pursuits of one's own pleasure, and to open oneself to the other, to mutual aid and to self-giving" CCC 1609 "… Jesus himself gives the strength and grace to live marriage in the new dimension of the Reign of God." CCC 1615

What is conjugal love?

"Conjugal love involves a totality, in which all the elements of the person enter - appeal of the body and instinct, power of feeling and affectivity, aspiration of the spirit and of will. It aims at a deeply personal unity, a unity that, beyond union in one flesh, leads to forming one heart and soul; it demands indissolubility and faithfulness in definitive mutual giving; and it is open to fertility." CCC1643

What are the two purposes of the Sacrament of Matrimony?

"The matrimonial covenant…by its nature ordered toward the good of the spouses and the procreation and education of offspring." CCC1601

What three questions are asked at a Catholic wedding ceremony?
  1. Have you come here freely and without reservation to give yourselves to each other in marriage?
  2. Will you love and honor each other for the rest of your lives?
  3. Will you accept children lovingly and bring them up according to the law of Christ and His Church?
When is a couple legally married for the State/for the Church?

State requires witnesses of your marriage to sign the marriage license after the verbal consent.  Church holds the exchange of consent between spouses to be the indispensable element that "makes the marriage."  Consent consists in a "human act by which the partners mutually give themselves to each other".  This consent binds…the two "becoming one flesh."  CCC1626-7 "From a valid marriage arises a bond…in such a way that a marriage concluded and consummated between baptized persons can never be dissolved." CCC1638-40  "In marriage the physical intimacy of the spouses becomes a sign and pledge of spiritual communion." CCC 2360

What does the Church say when abuse is present in a marriage relationship?

"Yet there are some situations in which living together becomes practically impossible for a variety of reasons. In such cases the Church permits the physical separation of the couple and their living apart." CCC1649

The Church does not condone any type of abuse. The Church encourages couples to get professional help at the first sign of abuse. Many abusers were brought up in their family of origin to accept abusive behavior.

What does society and the Church teach about cohabitation?

"Fornication is a carnal union between an unmarried man and unmarried woman. It is gravely contrary to the dignity of persons and of human sexuality which is naturally ordered to the good of spouses and the generation and education of children." CCC 2353

Social science studies reveal that cohabitation is a preparation for divorce. Cohabitation sets up a mind set that if the relationship gets tough the couple dissolves the relationship without going to court for a divorce.  Not engaging in sexual intimacy before marriage is a preparation for marriage since abstinence requires commitment, self-control, and perseverance – all essential virtues for a successful marriage.

What does having an "informed conscience" mean?

"A well-formed conscience is upright and truthful. It formulates its judgments according to reason, in conformity with the true good willed by the wisdom of the Creator. Everyone must avail himself of the means to form his conscience." CCC1798

"Faced with a moral choice, conscience can make either a right judgment in accordance with reason and the divine law or, on the contrary, an erroneous judgment that departs from them." CCC 1799

Who is responsible for deciding the number of children in a family?

"The parents themselves should ultimately make this judgment, in the sight of God. But in their manner of acting spouses should be aware that they cannot proceed arbitrarily."… "This Council realizes that certain modern conditions often keep couples from arranging their married lives harmoniously, and that they find themselves in circumstances where at least temporarily the size of their families should not be increased."… (The Documents of Vatican II)

What should parents take into consideration when deciding to limit family size?

"They will thoughtfully take into account both their own welfare and that of their children, those already born and those which may be foreseen. For this accounting they will reckon with both the material and the spiritual conditions of the times as well as of their state in life. Finally, they will consult the interests of the family group, of temporal society, and of the Church herself." (The Documents of Vatican II)

What does the Church teach about abortion, sterilization, contraception, and natural family planning?

"We are obliged once more to declare that…abortions…are to be absolutely excluded as lawful means of regulating the number of children…. Equally to be condemned…is direct sterilization…. Similarly excluded is any action which either before, at the moment of, or after sexual intercourse, is specifically intended to prevent procreation – whether as an end or as a means." (On Human Life #14) "If there are serious motives to space out births...It is then licit to take into account the natural rhythms...and this way to regulate birth." (On Human Life #16)

What are signs of fertility during a woman's cycle?
Fertile mucus Temperature
Mood swings Cervical signs
Lymph node sign Skin/eye changes
Swelling and tenderness at labia Mucus changes after ovulation
Besides "egg" and "sperm", what other substance is needed for conception?

Fertile mucus.

What are the four major natural family planning methods and how does each determine the time of fertility?
  1. 1930s Rhythm/Calendar (based on past cycle lengths)
  2. 1940s Temperature (based on a rise of basal body temperature after ovulation)
  3. 1950s Sympto-Thermal (based on 3 signs of fertility: mucus, temperature, and cervical changes)
  4. 1960s Mucus Method (based on presence of fertile mucus before ovulation)
  5. 1990s Sympto-Hormonal Method (based on the detection of reproductive hormones using a fertility monitor either alone or in conjunction with another sign of fertility such as mucus or temperature)