FertilityUnderstanding Ovulation and Your Fertile Window

What Is Ovulation?

Ovulation is the release of a mature egg from the ovary. It typically occurs once per menstrual cycle, usually about 12–16 days before your next period begins.¹ After release, the egg survives 12–24 hours, while sperm can survive up to five days inside the reproductive tract. The fertile window includes the five days before ovulation and the day of ovulation itself.

Understanding timing is central to fertility awareness.

Explore how ovulation works and what triggers it

Signs of Ovulation

Some individuals notice physical signs that ovulation is approaching. Common signs may include:

• Changes in cervical mucus (clear, stretchy texture)
• Mild pelvic discomfort (mittelschmerz)
• Slight increase in basal body temperature after ovulation
• Increased libido

Tracking these signs can help identify your fertile window.

Recognize the physical signs that ovulation is approaching

Tracking Your Fertility Window

Several methods can help track ovulation, including basal body temperature charting, cervical mucus monitoring, ovulation predictor kits, and fertility apps. Ovulation kits detect luteinizing hormone (LH) surges that signal ovulation is likely within 24–36 hours. Tracking improves timing accuracy.

Learn how to chart your fertility cycle for better timing

Find out how ovulation tests work and when to use one

Getting Pregnant After Ovulation

Because the egg survives only 12–24 hours, intercourse is most effective in the days leading up to ovulation. Understanding the short viability window of the egg helps clarify why earlier timing matters.

Understand the best timing for intercourse relative to ovulation

Cervical Mucus and Fertility

Cervical mucus changes throughout the menstrual cycle. During peak fertility, it becomes clear and slippery, resembling egg whites, and supports sperm movement. Observing these changes can help identify peak fertility days.

Learn how to read cervical mucus changes to identify fertile days

Age and Fertility

Fertility naturally declines with age, especially after 35,² primarily due to changes in egg quantity and quality. Age does not eliminate the possibility of pregnancy, but it may affect timing and strategy.

Get tailored guidance on trying to conceive after age 35

Supporting Fertility Naturally

Lifestyle factors that may support fertility include maintaining a healthy weight, eating nutrient-dense foods, limiting alcohol, avoiding smoking, and managing stress. Always consult a healthcare provider before starting supplements.

Discover evidence-based ways to boost your fertility naturally

Explore herbal and supplemental approaches to supporting fertility

Irregular Periods and Ovulation

Irregular cycles can make predicting ovulation more challenging. If cycles are consistently irregular or absent, medical evaluation may be helpful.

Find out how to track ovulation when your cycle is irregular

Fertility Lubricants and Sperm Survival

Certain lubricants may negatively affect sperm motility. Using compatible products may support sperm survival.

Find fertility-friendly lubricant options that won’t affect sperm

Learn which everyday lubricants are safe to use when trying to conceive

When to Seek Evaluation

If pregnancy does not occur after 12 months (under age 35) or 6 months (age 35 or older), consider consulting a healthcare provider. Fertility evaluation provides clarity and direction.

See which fertility tests are available and what they reveal

Moving Forward with Understanding

Fertility involves precise biological timing. Learning how your cycle works can empower you during the conception process. Understanding your fertility is the first step toward informed decisions.

Explore what to do if you are having difficulty conceiving

Get an in-depth look at IVF and assisted reproductive technology