How can I track my cycle – and do ovulation tests really make sense?
The question of whether it is useful to “track” the menstrual cycle is frequently asked during fertility consultations. For many women, knowing the timing of ovulation or the fertile window provides a sense of reassurance.
The range of available tracking methods is vast; effort, cost (CHF 20–250), and accuracy vary considerably. As a result, many women wonder whether cycle tracking is useful at all, and if so, which method makes sense.
Common methods of cycle tracking
The most commonly used methods include:
- Calendar-based methods
- Observation of cervical mucus
- Basal body temperature tracking (BBT method)
- Urinary testing of luteinizing hormone (LH)
- Wearable and physiological sensor technology
Calendar-based methods
Calendar-based methods estimate ovulation based on cycle length, assuming a constant luteal phase. However, they are limited by cycle variability and show low accuracy, particularly in women with irregular cycles.
Nevertheless, recording menstrual bleeding and the presumed time of ovulation is always useful, as it can help identify cycle irregularities and allows calculation of gestational age once pregnancy occurs.
Observation of cervical mucus
This method is based on identifying changes in vaginal secretions. The peak of clear, stretchy cervical mucus correlates with the highest level of fertility. However, interpretation is subjective—some women produce very little mucus, making it difficult to observe.
Basal body temperature (BBT)
BBT tracking detects the rise in temperature after ovulation has already occurred. As a result, ovulation is only identified retrospectively, limiting the usefulness of this method for predicting the fertile window. This explains why BBT has lower reliability compared to other methods.
LH urine tests
LH urine tests are widely used and correlate well with the LH surge preceding ovulation. They allow relatively reliable prediction of ovulation within 1–2 days.
However, false-positive results may occur, particularly in women with hormonal disorders such as polycystic ovary syndrome (PCOS).
Wearable and physiological sensors
Wearable sensors (e.g. the Oura Ring or wrist-based skin temperature devices) offer higher accuracy than calendar- and BBT-based methods. By continuously collecting data, they provide better predictive value, especially in women with irregular cycles, although accuracy may decrease in unusually long or atypical cycles.
Is cycle tracking useful for women with regular cycles?
Studies have shown that the use of LH tests may slightly shorten the time to pregnancy. At the same time, the following aspects should be considered:
- High costs
- Time-consuming use
- Potential for inaccurate results
- Possible stress on relationships and sexual life
In our experience, highly goal-oriented intercourse “by schedule” can be particularly burdensome.
For women who are able to perceive ovulation themselves (e.g. mittels ovulatory pain or fertile cervical mucus), we therefore recommend—for the sake of sexual wellbeing—refraining from cycle tracking and instead having intercourse 2–3 times per week, without focusing on “perfect timing.” Using this approach, most women conceive within one year.
When is clinical cycle monitoring recommended?
Clinical cycle monitoring is recommended in the following situations:
- Irregular cycles (shorter than 23 days or longer than 35 days)
- Absent menstruation
- Suspected absence of ovulation
- Known male factor infertility
- Failure to conceive after:
- 12 months of unprotected intercourse
- 6 months in women over 35 years of age
Clinical cycle monitoring is performed using:
- Transvaginal ultrasound examinations
- Serum hormone measurements (LH, estradiol, progesterone)
These methods represent the gold standard for confirming ovulation and provide the most accurate results.
Counselling
We are happy to advise women and couples planning a pregnancy on the various methods of cycle observation during our consultations.
Please book an appointment with our fertility team.
