Do you know when your fertile window opens?

Ovulation is the moment one of your ovaries releases a mature egg. It happens roughly once per cycle, it takes only a few minutes, and most of the time you feel nothing at all. Everything else in your cycle, the bleeding, the shifts in energy, the changes in discharge, is your body either preparing for that moment or responding to it.

Pick an answer, get the explanation straight away, and see your score at the end.

Question 1 of 12

Which hormone rises sharply in the day or two before ovulation?

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Luteinizing hormone climbs steeply about 24 to 36 hours before the egg is released, then falls again. This surge is exactly what a drugstore ovulation test looks for in your urine. Progesterone is the hormone that rises afterwards, once ovulation has already happened.

Question 2 of 12

Which organ actually releases the egg?

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Eggs mature inside fluid filled sacs called follicles in your ovaries, and one ovary releases the mature egg each cycle. The fallopian tube then catches it and carries it toward the uterus. The uterus is where a fertilized egg may implant, not where the egg starts out.

Question 3 of 12

Once released, how long can the egg be fertilized?

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The egg has a short shelf life: roughly 12 to 24 hours. If no sperm reaches it in that time, it breaks down and the cycle moves on. This is why timing matters so much, and why sperm usually needs to already be waiting.

Question 4 of 12

How long can sperm survive inside the reproductive tract?

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In fertile cervical mucus, sperm can stay alive and capable for up to about five days. That means sex several days before ovulation can still lead to pregnancy. It is the main reason the fertile window opens well before the egg ever appears.

Question 5 of 12

How many days long is the fertile window in a typical cycle?

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The window runs roughly six days: the five days before ovulation plus the day of ovulation itself. Its length comes from how long sperm survives, not from how long the egg lasts. The chance of conceiving is highest in the two or three days right before the egg is released.

Question 6 of 12

In a textbook 28 day cycle, when does ovulation usually happen?

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Around day 14 is the average for a 28 day cycle, counting day one as the first day of bleeding. The average is not a rule though: the timing shifts with cycle length and can move from month to month in the same person. What stays steadier is the gap between ovulation and your next period, usually around 12 to 14 days.

Question 7 of 12

What does cervical mucus typically look like around ovulation?

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As estrogen peaks, discharge turns clear, wet, and stretchy, which makes it far easier for sperm to travel upward. After ovulation it usually thickens again or dries up. Watching this change is one of the cheapest and most reliable ways to spot your fertile days.

Question 8 of 12

What happens to your basal body temperature after ovulation?

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Rising progesterone nudges your resting temperature up by a small amount, often around 0.3 degrees Celsius, and it holds there until your next period starts. Because the rise comes after the egg is released, temperature confirms ovulation rather than predicting it. It is best measured first thing, before you get out of bed.

Question 9 of 12

Some people feel a one sided ache around ovulation. What is it called?

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Mittelschmerz is German for middle pain, and it describes the twinge or dull ache on one side of the lower belly that some people notice as a follicle releases its egg. It usually lasts a few hours to a day and switches sides between cycles. Plenty of people never feel it, and that is completely normal.

Question 10 of 12

Which of these can stop ovulation from happening?

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Cycles without ovulation are called anovulatory, and the causes range from PCOS and thyroid problems to heavy training, undereating, chronic stress, and the natural shift of perimenopause. Most hormonal contraception works by preventing ovulation on purpose. If you suspect you are not ovulating, that is worth raising with a doctor.

Question 11 of 12

Roughly how many eggs are you born with?

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All your eggs are made before you are born, somewhere in the range of one to two million. The number falls steadily from then on, leaving around 300,000 by puberty, and only a few hundred are ever ovulated. Sperm production works the opposite way, restocking throughout life.

Question 12 of 12

For a healthy couple under 35 with well timed sex, what is the chance of conceiving in one cycle?

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Even with perfect timing and no fertility problems, a single cycle carries roughly a one in four chance. That is why most couples take several months rather than one, and why one or two cycles without a positive test says very little. Doctors generally suggest a check in after a year of trying, or after six months if you are over 35.

A solid starting point

You got some of these, and the ones you missed are the interesting part. Ovulation is genuinely poorly taught, so most people arrive at adulthood knowing the word and very little else. Nothing here reflects on you.

The fastest way to make this stick is to watch it happen in your own body rather than memorize facts. Track your cycle for a couple of months, note your discharge and how you feel, and the pattern shows up on its own.

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You know your way around a cycle

You have the core of it: roughly when ovulation happens, why the fertile window opens early, and what your body does around it. The gaps you have are the details that separate a rough idea from a usable one.

This is the point where tracking pays off most. Once you log a few cycles alongside your signs, you stop relying on averages and start reading your own timing.

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Impressively well informed

That is a strong result. You understand that the fertile window is driven by sperm survival, that temperature confirms rather than predicts, and that day 14 is an average rather than a promise. Most people never get this far.

The remaining edge is personal data. Knowing how ovulation works in general is one thing, knowing how it works in you, cycle after cycle, is what actually helps you plan.

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About this quiz

Why the fertile window matters

You can only conceive during a short stretch of days each cycle, and it is shorter than most people think. Knowing where that window sits is useful if you are trying for a baby, and it is just as useful if you are not. The same knowledge tells you why your skin, mood, sleep, and appetite move on a schedule, and it gives you a clear signal when something in your cycle changes.

The myths worth dropping

That ovulation always lands on day 14. That a regular period guarantees you ovulated. That you can only get pregnant on one day. That an app prediction is the same thing as a confirmed ovulation. Each of these is common, and each one leads people to read their own bodies wrong.

How this quiz works

Twelve questions, one right answer each, and a short explanation after every pick so you learn whether you got it right or not. It takes about three minutes. There is no score to be embarrassed about: most people miss a few, and the ones they miss are usually the most useful things to learn.

References

Trying to get pregnant NHS. https://www.nhs.uk/pregnancy/trying-for-a-baby/trying-to-get-pregnant/. 3 August 2026.
Ovulation Cleveland Clinic. https://my.clevelandclinic.org/health/articles/23439-ovulation. 3 August 2026.
Fertility Awareness-Based Methods of Family Planning American College of Obstetricians and Gynecologists. https://www.acog.org/womens-health/faqs/fertility-awareness-based-methods-of-family-planning. 3 August 2026.
How to get pregnant Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/getting-pregnant/in-depth/how-to-get-pregnant/art-20047611. 3 August 2026.
Menstruation Eunice Kennedy Shriver National Institute of Child Health and Human Development. https://www.nichd.nih.gov/health/topics/menstruation. 3 August 2026.
Infertility Eunice Kennedy Shriver National Institute of Child Health and Human Development. https://www.nichd.nih.gov/health/topics/infertility. 3 August 2026.
Periods and fertility in the menstrual cycle NHS. https://www.nhs.uk/conditions/periods/fertility-in-the-menstrual-cycle/. 3 August 2026.