Your body gives several reliable signals when ovulation is approaching or happening, from changes in cervical mucus to a small rise in body temperature. Some signs appear before the egg is released (helping you predict ovulation), while others confirm it after the fact. Knowing the difference matters, especially if you’re trying to conceive.
Cervical Mucus Changes
The single most observable day-to-day sign of ovulation is a shift in cervical mucus. In the days after your period, discharge is typically minimal and dry or sticky. As ovulation approaches, rising estrogen transforms it: the mucus becomes wet, stretchy, and slippery, closely resembling raw egg whites. You can check by wiping with toilet paper or gently pressing a sample between your thumb and index finger. Fertile-quality mucus stretches into a clear strand without breaking.
This egg-white mucus typically shows up for about three to four days around ovulation and serves a biological purpose. It creates a hospitable environment that helps sperm travel through the cervix and survive longer. Once ovulation passes and progesterone rises, the mucus thickens again and becomes sticky or tacky, signaling that the fertile window has closed. Tracking these patterns over two or three cycles gives you a reliable picture of your personal timeline.
Basal Body Temperature
Your resting body temperature shifts slightly after you ovulate. Before ovulation, basal body temperature (BBT) tends to hover in a lower range. After the egg is released, progesterone causes a sustained rise of 0.4°F to 1°F (roughly 0.2°C to 0.6°C). The catch is that this rise happens after ovulation, so it confirms the event rather than predicting it. You won’t see it coming in time to act on it for that particular cycle.
To use BBT tracking, you need a thermometer accurate to at least one-tenth of a degree, and you need to take your temperature at the same time every morning before getting out of bed. After a few months of charting, you’ll see a pattern: a cluster of lower temperatures followed by a clear upward shift that stays elevated until your next period. That shift, sustained for three or more days, is strong confirmation that ovulation occurred. Illness, poor sleep, and alcohol can throw off individual readings, so the trend across the full cycle matters more than any single day.
Ovulation Pain
Some people feel a distinct twinge or cramp on one side of the lower abdomen around the time the egg is released. This is called mittelschmerz, and it can range from a mild pinch to a sharper ache. It usually lasts a few minutes to a few hours, though occasionally it lingers for a day or two. The side may alternate from month to month depending on which ovary releases the egg.
Not everyone experiences ovulation pain, and some people only notice it occasionally. It’s a useful supplementary clue if you feel it, but it’s not reliable enough to use as your only indicator.
Ovulation Predictor Kits
If you want a more objective answer, urine-based ovulation predictor kits (OPKs) detect the surge in luteinizing hormone (LH) that triggers egg release. LH levels spike roughly 36 to 40 hours before ovulation, so a positive test tells you the egg is likely coming within the next day or two. That makes OPKs one of the most practical tools for timing.
Accuracy across major brands is high. A 2024 study comparing five popular kits found that surge detection accuracy ranged from about 92% to 97% when measured against blood LH levels. Price didn’t meaningfully affect reliability, though sensitivity (the ability to catch every surge) varied somewhat between brands. The most important thing is to start testing a few days before you expect to ovulate and to test at the same time each day, ideally in the afternoon when LH concentrations in urine tend to be higher.
A positive OPK means LH is surging, not that you’ve already ovulated. If you’re trying to conceive, the two days following a positive result are your peak window, since sperm can survive in the reproductive tract for three to five days.
Cervical Position
Your cervix itself changes throughout the cycle, and checking its position adds another layer of information. During non-fertile days, the cervix sits lower in the vaginal canal and feels firm (similar to the tip of your nose), and its opening is closed. As estrogen rises near ovulation, the cervix moves higher, becomes softer (more like your lips), and the opening feels slightly open. It can also become harder to reach with a fingertip.
This method has a learning curve. It takes a few cycles of daily checking in the same position (squatting or with one foot elevated) to recognize the differences. Most people use cervical position alongside mucus tracking and temperature charting rather than as a standalone method.
Secondary Body Signals
Beyond the primary signs, several subtler changes can accompany ovulation. Breast tenderness or sore nipples are common. Before ovulation, high estrogen can stimulate breast tissue, and shortly afterward, the shift to progesterone may trigger a second wave of soreness. Some people also notice mild bloating, increased sex drive, or heightened sensitivity to smells around their fertile window. These signals vary widely from person to person and cycle to cycle, so they work best as supporting evidence rather than primary indicators.
Saliva Ferning Tests
A less common option involves looking at dried saliva under a small microscope. When estrogen rises near ovulation, the salt content in saliva increases, and the dried sample can form a fern-like crystalline pattern. Small handheld microscopes are sold for this purpose.
The FDA notes significant limitations with these tests. Not all people produce visible ferning patterns. Eating, drinking, smoking, and brushing your teeth can disrupt results. Ferning can also show up outside the fertile window, during pregnancy, and even in men. Because of this unreliability, saliva tests are best treated as a curiosity rather than a dependable tracking method.
Combining Methods for Accuracy
No single sign is perfectly reliable on its own. The most accurate picture comes from layering two or three methods together. A practical combination for most people: track cervical mucus daily (your best predictive sign), use an OPK starting a few days before your expected ovulation (for confirmation that the LH surge is happening), and chart BBT each morning (to verify after the fact that ovulation occurred). When mucus, LH test, and temperature all align, you can be confident about your ovulation timing.
If your cycles are irregular, these signs become even more valuable than calendar-based predictions, since the actual day of ovulation can shift significantly from month to month. Paying attention to your body’s signals, rather than relying on a fixed “day 14” estimate, gives you a much more accurate read on what’s actually happening in any given cycle.