BBT, cervical mucus, and cycle signs — how to know when you're ovulating without spending a fortune.
Ovulation strips, fertility monitors, and wearable devices can cost hundreds of pounds a year. But your body has been signalling ovulation for decades — you just need to know what to look for. Here's how to track ovulation naturally using methods that are free, accurate, and give you genuinely useful data.
Your resting body temperature rises by 0.2–0.5°C after ovulation due to progesterone. By tracking it every morning before getting out of bed, you can confirm that ovulation happened and — over several cycles — predict when it's likely to happen next.
Limitation: BBT confirms ovulation has already happened — it doesn't predict it in real time. But over cycles, the pattern helps you identify your personal ovulation timing.
Cervical mucus changes dramatically across your cycle in response to estrogen. Learning these patterns gives you a real-time fertility signal that can actually predict ovulation — unlike BBT which only confirms it after.
| Cycle Phase | Mucus Appearance | Fertility Signal |
|---|---|---|
| Menstruation | Blood | Not applicable |
| Post-period | Dry / absent | Low fertility |
| Approaching ovulation | Sticky, white/cloudy | Building fertility |
| Peak fertility | Clear, slippery, like raw egg white | Highest fertility — ovulation imminent |
| Post-ovulation | Sticky, thick, or absent | Fertility declining |
The "egg white cervical mucus" (EWCM) phase is your highest-fertility window. Ovulation typically occurs within 1–2 days of peak EWCM.
If your cycles are regular, ovulation typically occurs 14 days before your next period — not necessarily day 14 from the start. So if you have a 32-day cycle, you likely ovulate around day 18. A period tracker calculates this automatically once it has 3+ cycles of data.
Many women experience physical signs of ovulation once they start paying attention:
Using BBT + cervical mucus together is called the Sympto-Thermal Method and is significantly more accurate than either method alone. Studies show 99.6% effectiveness as a natural family planning method when used correctly.
Log all your fertility signs in WomensPal. Free fertility tracking — no ovulation strips required.
Start free →Yes — BBT charting and cervical mucus monitoring are accurate natural methods. The Sympto-Thermal Method combining both is 99.6% effective at identifying your fertile window.
BBT accurately confirms ovulation in the previous cycle and over time helps predict your ovulation timing. It doesn't predict ovulation in real time — cervical mucus monitoring does.
Fertile cervical mucus (called EWCM — egg white cervical mucus) is clear, slippery, and stretches between your fingers. It appears 1–5 days before ovulation and is your highest-fertility signal.
WomensPal lets you log BBT readings daily alongside cycle and symptom data. It graphs your temperature chart over time and identifies the ovulation shift.