Rules of the Billings Method

Early Day Rules (rules for the
pre-ovulatory phase)

  • Rule 1 – avoid intercourse on
    days of heavy bleeding during menstruation.

    [Ovulation might occur quite early in the cycle and menstrual
    bleeding could obscure mucus.]

  • Rule 2 – Alternate evenings are
    available for intercourse when these days have been recognized
    as infertile. (Basic Infertile Pattern  (BIP) )

    [Evenings are recommended for intercourse during the BIP
    as the woman needs to be in an upright position for a few hours
    for cervical mucus to make its presence felt at the vulva. Seminal
    fluid on the day following intercourse could obscure the mucus.
    It is important to allow time for the seminal fluid to disappear
    and to confirm the BIP is still present by avoiding intercourse
    on consecutive evenings. ]

  • Rule 3 – Avoid intercourse on
    any day of discharge or bleeding which interrupts the Basic
    Infertile Pattern. Allow 3 days of the Basic Infertile Pattern
    afterwards before intercourse is resumed on the fourth evening.
    Rule 2 continues.

    [Waiting will enable the woman to either recognise the Peak
    in which case the Peak Rule is used; or, when the change is
    an interruption of the BIP caused by raised oestrogens, the
    hormonal level will return to a basic low level and the woman
    will recognise a return of the BIP. She counts 3 days to enable
    the hormones to stabilise before resuming intercourse applying
    Early Day Rule 2.]


The Peak Rule (Rule 4):

  • From the beginning of the fourth
    day following the Peak until the end of the cycle, intercourse
    is available every day at any time.

    [Ovulation occurs on the Peak Day or days 1 or 2 following
    the Peak. The egg will live for 12-24 hours
    unless fertilised. The third day after the Peak is to allow
    for the life time of the egg. From the fourth day after the
    Peak the woman is infertile until the end of the cycle and intercourse
    is available at any time.]

To Achieve a Pregnancy

Apply the Early Day Rules.

Postpone intercourse until the slippery sensation occurs.

Intercourse should occur over the time of the slippery sensation
and for one or two days after.

For the Postponement of Pregnancy: Rules 1-4


JABFM – Online Survey

The Performance of Fertility Awareness-based Method Apps Marketed to Avoid Pregnancy; JABFM July–August 2016 Vol. 29 No. 4 pp. 508-511. Introduction: In recent years there has been an explosion in the development of medical apps, with more than 40,000 apps now available. Nearly 100 apps allow women to track their fertility and menstrual cycles and can be used to avoid or achieve pregnancy…
Read the full article here »