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Natural methods for fertility tracking
Natural methods cover several ways of observing your body's signals — temperature, cervical mucus, cervix — to identify your fertile and infertile phases, without hormones or devices. It isn't a single method, but a family of methods: each has its own rules, its own level of rigour, and its own history.
Here are the four most recognised methods — the very ones Happy Fertility helps you track every day.
Billings, the ovulation method
A single sign to observe: cervical mucus. Simple to get started with, it mostly asks for consistency in daily observation.
Discover the Billings method →
FertilityCare, the Creighton Model
A standardised way of charting mucus observations, supported by certified instructors — often chosen for its rigorous framework and its link to medical fertility follow-up.
The sympto-thermal method
It cross-checks several signs — temperature and mucus, sometimes the cervix — to confirm the fertile window through multiple indicators rather than a single one.
Discover the sympto-thermal method →
Sensiplan
The German sympto-thermal method, one of the most studied and most codified, with precise rules for determining the start and end of the fertile period.
The I2F Chart
A daily log inspired by the methods taught by the Institut de Formation à la Fertilité (I2F), viewing ovulation as a marker of overall health.
Which one should you choose?
There's no universally "best" method: the right choice depends on how much time you can put into learning it, how comfortable you are with a given cycle sign, and how much support you're looking for. They all share one thing: their reliability depends directly on how consistently and carefully you observe.
Still weighing natural methods against other tracking options? Our natural methods: for and against page answers the most common objections.
Whichever method suits you, Happy Fertility helps you log your observations in a few seconds a day and share your calendar with your partner.
