The short answer: Ovulation is when one of your ovaries releases a mature egg, usually once per cycle. It happens about 14 days before your next period, so it falls on day 14 only if your cycle is around 28 days. Signs include clear, stretchy discharge like raw egg white, a small rise in resting temperature after ovulation, a positive LH test, a cervix that feels softer and higher, tender breasts and sometimes a one-sided twinge called ovulation pain. Ovulation pain is common and usually harmless, but severe or lasting pain needs a doctor.
What happens when you ovulate
Each ovary holds thousands of tiny fluid-filled sacs called follicles, and each follicle contains an immature egg. In the first part of your cycle, several follicles start to grow. Around days 10 to 14 of a 28-day cycle, one becomes the leader and its egg matures.
When oestrogen from that growing follicle reaches a high level, your brain releases a sudden burst of luteinising hormone (LH). This LH surge makes the follicle burst and release its egg. Cleveland Clinic notes the release itself takes only a few seconds, though the signs can start days before.
The egg is swept into the fallopian tube, the narrow tube between the ovary and the womb. It survives only about 12 to 24 hours. If it meets sperm, it may be fertilised. If not, it breaks down and is reabsorbed by the body, and about two weeks later your period comes.
The empty follicle then turns into a temporary gland that makes progesterone, which prepares the womb lining and slightly raises your body temperature. For the full hormone story, read The Hormones Behind Your Menstrual Cycle, Phase by Phase.
When does ovulation happen? Not always on day 14
Day 14 is the textbook answer because it is the middle of a 28-day cycle. But a normal cycle can be anywhere from 21 to 35 days. The more useful rule is that most people ovulate about 14 days before their next period. The first half of the cycle varies in length; the second half is fairly steady.
| Your usual cycle length | Next period due on | Ovulation likely around |
|---|---|---|
| 21 days | Day 22 | Day 7 |
| 26 days | Day 27 | Day 12 |
| 28 days | Day 29 | Day 14 |
| 32 days | Day 33 | Day 18 |
| 35 days | Day 36 | Day 21 |
Day 1 is always the first day of proper bleeding, not spotting. These are estimates: ovulation can shift by a few days from month to month, especially after illness, travel, exam stress or a family function that disrupted sleep for a week.
Because sperm can survive for several days, your fertile window starts a few days before ovulation. To work out your own dates step by step, use How to Calculate Your Next Period Date (With Examples).
Signs you are ovulating
Not everyone notices signs, and that is normal. These are the most useful ones, from the easiest to spot to the more technical.
Changes in discharge
In the days just before ovulation, rising oestrogen makes cervical mucus clear, wet, slippery and stretchy, like raw egg white. This texture helps sperm travel. After ovulation, discharge usually becomes thicker, stickier or drier. Our guide to normal vaginal discharge through the month shows the full pattern.
Basal body temperature
Your basal body temperature is your temperature at complete rest, first thing in the morning. After ovulation, progesterone raises it slightly. Healthdirect, the Australian government health service, puts the rise at about 0.2 to 0.5°C. That is too small to feel, so you need a sensitive digital thermometer and a reading every morning before you get up, eat or drink.
The catch is that the rise appears after ovulation, so a temperature chart confirms that you ovulated rather than warning you in advance. A fever, a late night, alcohol or a broken sleep with a baby can all throw a reading off.
LH test strips
Ovulation predictor kits, sold at most Indian pharmacies and online, detect the LH surge in your urine. Cleveland Clinic says they usually turn positive within about 36 hours before ovulation. Start testing a few days before you expect to ovulate, based on your cycle length, and keep going until you get a positive.
If your cycles are very irregular, LH tests can be harder to time and may need many strips, so talk to your doctor if you are trying to conceive.
Other body signs
- Breast tenderness
- Mild bloating
- A one-sided twinge or ache in the lower tummy (ovulation pain)
- Light spotting
- Higher sex drive, a sharper sense of smell, or appetite and mood changes
| Sign | What you notice | Good for |
|---|---|---|
| Discharge | Clear, slippery, stretchy mucus | Seeing that ovulation is coming in the next few days |
| LH test | Positive line on a urine strip | Predicting ovulation about a day or so ahead |
| Basal body temperature | A small, lasting rise on your morning chart | Confirming that ovulation has already happened |
| Cervix | Softer and harder to reach | A supporting sign once you know your own pattern |
| Ovulation pain | A twinge on one side of the lower tummy | A rough clue, not a reliable marker |
How your cervix changes around ovulation
Your cervix is the neck of the womb, at the top of the vagina. It changes through the month. Cleveland Clinic says the cervix is at its softest and most difficult to reach during ovulation, because it sits higher up. At other times it is easier to reach and can feel firmer. During your period it opens slightly to let blood flow out.
How to check, if you want to
- Wash your hands well and make sure your nails are short and smooth.
- Squat, or stand with one foot on the edge of the bathtub or a low stool.
- Gently slide one or two fingers into the vagina until you feel a rounded bump with a small dimple in the middle. That is your cervix.
- Notice how high it is and whether it feels firm or soft. Stop if it hurts.
- Check at the same time each day and write it down; one check on its own tells you very little.
Cervix checks are optional. Many women find discharge and LH tests easier and more comfortable. Don't check if you have an infection, have recently had a baby or a procedure, or have been told to avoid it by your doctor.
Ovulation pain (mittelschmerz)
Mittelschmerz is German for "middle pain", and it describes pain at ovulation, about two weeks before a period. Cleveland Clinic says it may affect up to 40% of people who ovulate.
What it feels like
- A dull ache or a sudden sharp twinge, low down on one side of your tummy
- It may switch sides from month to month, depending on which ovary releases the egg
- It lasts from a few minutes to one or two days, according to the NHS
- Some people also notice light bleeding, egg-white discharge, low back ache or, if the pain is strong, nausea
The pain is thought to come from the follicle stretching and then bursting to release the egg. Having it does not mean you are more fertile, and not having it does not mean you aren't ovulating.
What helps
A warm bath, a hot water bottle on the sore side and over-the-counter painkillers such as paracetamol or ibuprofen are usually enough; check the packet or ask a pharmacist. If the pain is bad every month, your doctor may suggest contraception that stops ovulation, such as the combined pill or an implant.
Ovulation pain vs period cramps
Both feel crampy and low in the tummy, so it is easy to confuse them. Timing is the biggest clue, which is why a simple calendar note on painful days helps your doctor so much.
| Feature | Ovulation pain | Period cramps |
|---|---|---|
| When | Mid-cycle, about 14 days before your next period | Just before and during the first days of your period |
| Where | Usually one side of the lower tummy | Across the lower tummy, often spreading to the back and thighs |
| How long | Minutes to one or two days | Usually one to three days, easing as bleeding settles |
| Feels like | A twinge, sharp stab or dull one-sided ache | Squeezing, cramping waves |
| Bleeding | None, or very light spotting | Your period |
| What helps | Warmth, paracetamol or ibuprofen | Warmth, gentle movement, paracetamol or ibuprofen |
If your period pain is the bigger problem, see Is My Period Pain Normal? and, for the medical terms around painful and heavy periods, Dysmenorrhoea vs Menorrhagia.
When ovulation pain needs a doctor
Pain in the middle of your cycle is not always ovulation. The NHS and Cleveland Clinic list other causes that can feel similar: endometriosis, ovarian cysts, infections such as chlamydia, pelvic inflammatory disease, scar tissue after surgery such as a caesarean, appendicitis, a twisted ovary (ovarian torsion) and ectopic pregnancy, where a pregnancy grows outside the womb.
See a doctor if mid-cycle pain doesn't ease with painkillers, lasts more than a day, happens most months, or comes with any of these:
- A missed period, or any chance you could be pregnant
- Fever or chills
- Burning or pain when you pee
- Severe nausea or vomiting
- Heavy bleeding between periods
- Pain during sex or unusual discharge
Ovulation spotting
Some women see a little pink or brown spotting around ovulation. It is usually very light, lasts a day or two and needs only a panty liner. Any bleeding between periods that is heavy, keeps happening or comes after sex should be checked by a doctor.
When you don't ovulate: anovulatory cycles
A cycle without ovulation is called anovulatory. You can still bleed, but without the progesterone that follows ovulation the lining may build up and shed unpredictably. Cleveland Clinic notes that a period can happen without ovulation, and ovulation can happen without a period, so bleeding alone does not prove you ovulated.
Common reasons
- PCOS: the most common hormonal cause of irregular or missed ovulation. See PCOS Explained.
- Thyroid problems: an underactive or overactive thyroid, or high levels of the milk hormone prolactin, can stop ovulation. Read Thyroid and Your Periods.
- Stress and heavy exercise: exams, a move, illness in the family or very intense training can delay the brain's signals.
- Weight: obesity can interfere with ovulation.
- Breastfeeding: high prolactin while feeding often pauses ovulation for months.
- Approaching menopause: in perimenopause, cycles where you ovulate become less regular.
Signs of not ovulating include very irregular cycles, cycles longer than 35 days, or several months with no period at all. A doctor can use blood tests, including thyroid and other hormone tests, and sometimes a scan, to find the cause. More causes are covered in Irregular Periods: Causes, Tests and What Helps.
Ovulation tracking vs period tracking
Period tracking means noting the first day of each period to predict the next one. Ovulation tracking goes further, using body signs to pinpoint the fertile days. They answer different questions.
| Question | Period tracking | Ovulation tracking |
|---|---|---|
| What you record | Start and end dates, flow, pain | Discharge, LH tests, temperature, cervix |
| Best for | Knowing when your period is due and spotting changes | Trying to conceive or understanding your own pattern |
| Effort | A minute a month | A few minutes most days |
| Accuracy | Good for regular cycles; rough for irregular ones | Better, especially when you combine two or more signs |
| Limits | Apps only estimate ovulation from dates | Not reliable contraception on its own unless properly learnt |
Tracking both also helps you link symptoms to your cycle, such as mood dips in the second half covered in PMS Mood Swings, Anxiety and Low Mood. Once you know your ovulation day, your period is likely about two weeks later, so you can keep a period panty ready in your bag for the days it might start.
A word on contraception: using fertility signs to avoid pregnancy needs proper teaching and careful daily records, and healthdirect notes pregnancy is more likely than with other methods. Don't rely on an app or a single sign.
See a doctor if
- Mid-cycle pain is severe, lasts more than a day, or happens most months
- Your cycles are often shorter than 21 days or longer than 35 days
- You have gone several months without a period and you are not pregnant
- You have bleeding between periods that is heavy or keeps happening
- You have been trying to get pregnant for some months without success, especially if your cycles are irregular
Get urgent help if
Call 112 or 108, or go to the nearest hospital emergency department, if:
- You have sudden, severe tummy pain, especially on one side, and you could be pregnant
- You feel faint or very dizzy along with tummy pain
- Pain is severe and comes with fever or vomiting
- Painkillers haven't helped severe pain at all
Frequently asked questions
Can I ovulate twice in one cycle? Usually only one egg is released per cycle. Occasionally two are released at around the same time, which is how non-identical twins happen.
How long does ovulation last? The release of the egg takes seconds, and the egg survives about 12 to 24 hours. Signs such as discharge changes can last several days around it.
Can you ovulate without a period? Yes. It can happen, for example, while breastfeeding or after a long gap. Equally, you can bleed without ovulating.
Does the pill stop ovulation? The combined pill generally stops ovulation when taken correctly. Some progestogen-only methods do not always stop it.
Why do I get ovulation pain on one side only? The pain comes from the ovary releasing the egg that month. The ovaries tend to take turns, so the side can change.
Is ovulation pain a sign of a problem? Usually not. It is common and harmless. See a doctor if it is severe, lasts more than a day or comes with fever, vomiting or a missed period.
Related reading
- How to Calculate Your Next Period Date (With Examples)
- The Hormones Behind Your Menstrual Cycle, Phase by Phase
- Normal Vaginal Discharge: What to Expect Through the Month
- Adenomyosis: Symptoms, Diagnosis and Treatment
This article is for general information and doesn't replace advice from your doctor.
Sources: Cleveland Clinic: Ovulation, NHS: Ovulation pain, Cleveland Clinic: Ovulation pain (mittelschmerz), Cleveland Clinic: Cervix, Healthdirect: Fertility awareness (natural family planning)