Cervical mucus: what your discharge says about your cycle

Vaginal discharge isn’t often talked about openly, but it’s a normal, healthy part of having a menstrual cycle. Its texture, color and amount change in a fairly predictable way through the month, and those changes are among the clearest real-time clues to where you are in your cycle. Once you know what to look for, cervical mucus can help you identify your most fertile days and notice when something might not be right.

What is cervical mucus?

Cervical mucus is a fluid produced by glands in the cervix, the narrow lower end of the uterus that opens into the vagina. It makes up a large part of your vaginal discharge. Think of it as a gatekeeper: for most of your cycle it’s thick and acts as a barrier, but around ovulation, rising estrogen makes it thin, slippery and sperm-friendly, helping sperm survive for up to 5 days and swim toward the egg. After ovulation, progesterone thickens it again.

How it changes through your cycle

Everyone’s pattern is a little different, but a typical cycle looks something like this:

• During your period: mucus is hidden by menstrual blood.
• Just after your period: you may have a few “dry” days with little or no noticeable discharge, or mucus that feels sticky or tacky and breaks easily.
• As estrogen rises: mucus becomes creamy, white or cloudy, with a lotion-like texture and a damp feeling.
• Approaching ovulation: it turns wetter and more watery, more abundant and clearer.
• Around ovulation: it’s often clear, slippery and stretchy, like raw egg white. It can stretch several centimeters (an inch or more) between your fingers without breaking, and you may feel noticeably wet. This is your most fertile mucus.
• After ovulation: it quickly becomes thicker and stickier, or dry again, and usually stays that way until your next period.

How to check your cervical mucus

Checking takes only a few seconds, and it gets easier with practice.

• Notice the sensation: during the day, pay attention to how your vulva feels: dry, damp, wet or slippery.
• Look at the toilet paper: before you pee, wipe front to back with clean, unscented toilet paper and look at the color and texture of any mucus.
• Try the stretch test: with clean hands, take a little mucus between your thumb and index finger and gently pull them apart. Does it break straight away, or stretch?
• Check several times a day, for example each time you use the bathroom, and record the most fertile type you noticed that day.

Using mucus to spot your fertile days

Your fertile window usually opens when you first notice creamy or wet mucus after your period, and fertility peaks on the days with the wettest, most slippery, stretchy mucus. The last day of this egg-white mucus is often called your peak day, and ovulation usually happens around then. The fertile time is generally considered to last until about three days after the peak day. If you’re trying to conceive, having sex every day or two while you notice wet, slippery mucus gives you the best chance. Mucus observations work even better combined with basal body temperature and LH tests.

Mucus observation is part of some fertility awareness methods, but on its own and without proper training, it is not a reliable form of contraception.

What can change your discharge

Several things can make mucus harder to read, so keep them in mind when you record your observations:

• Semen, lubricants and arousal fluid, which can look like fertile mucus
• Hormonal contraception, which usually suppresses the typical pattern
• Breastfeeding, coming off hormonal contraception, and perimenopause
• Some medicines, such as antihistamines, which can dry mucus
• Vaginal infections, which can change its color, texture and smell

Signs of a possible infection

Healthy discharge is usually clear or white (it can dry slightly yellowish on underwear) and has little or only a mild smell. Changes like these can be signs of an infection, such as bacterial vaginosis, thrush or a sexually transmitted infection:

• A strong or fishy smell, which may be more noticeable after sex
• A change in color to green, gray or yellow, or frothy discharge
• Thick, white discharge that looks like cottage cheese
• Itching, burning or soreness around the vagina or vulva
• Pain when you pee or during sex, pelvic pain, or unexpected bleeding