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Ovulation 101: Learn all about this stage of your cycle

Ovulation 101: Learn all about this stage of your cycle

5 min read

Many of us know that ovulation is the phase during the menstrual cycle when you can get pregnant, but what exactly happens in your body during ovulation?

For those who haven’t spent time trying to conceive a baby, you’re probably a lot more familiar with the period part of your cycle than with ovulation. If the last time you got an in-depth description of ovulation was high school sex ed, here’s the low-down on what’s going on during this phase.

The nitty gritty

There are four phases of your menstrual cycle: menstrual, follicular, ovulation, and luteal.

Ovulation is the shortest phase, lasting only a day or two out of a cycle that can be between 24 and 35 days (and even longer, for some people). The monthly process of ovulation is governed by hormones which relay chemical signals between your brain and your ovaries that let your body know when to release an egg each month.

During the follicular phase, the phase preceding ovulation, the brain releases follicle-stimulating hormone (FSH) which causes multiple follicles in your ovaries to mature. However, toward the end of the follicular phase, in the days right before ovulation, only one follicle fully matures an egg to release into the fallopian tube. As this one follicle matures, it begins to produce estradiol, a form of estrogen. The estradiol in this mature follicle cues the brain to increase production of luteinizing hormone (LH). LH, in turn, cues the follicle to grow bigger in size until it eventually ruptures, releasing the egg into the fallopian tube. The other follicles begin to disintegrate. As soon as the egg has been released into the fallopian tube, ovulation has begun.

The act of ovulation transforms the follicle that released an egg into what is called the corpus luteum which is latin for “yellow body.” The corpus luteum produces the hormone progesterone. Progesterone prepares the body for pregnancy if the egg is fertilized. An egg only survives for 12-24 hours and must be fertilized by sperm in this time if a pregnancy is to be achieved. Typically fertilization happens in the fallopian tube. Then the egg continues its journey down the tube and into the uterus. The journey to the uterus takes about 30 hours. Once in the uterus, a fertilized egg may implant in the uterine wall. This takes 5 or 6 days. If implantation occurs, the implanted embryo will begin to produce human chorionic gonadotropin (hCG) and that's what a pregnancy test is going to detect. If the egg is not fertilized, it dissolves after about 24 hours.

Ovulation and behavior

You may have heard claims that when you are ovulating, you are most attractive to others, your skin glows more, or potential mates can somehow pick up on your heightened fertility. There is still much more research that needs to be done before we can definitively say that ovulation changes how you look or behave. However, there are some preliminary studies that suggest that ovulation might impact attraction, flirtation, and dating/mating behaviors.

For example, one study of 237 women showed that women tend to show a heightened preference for social presence and competitiveness in males on fertile days versus non-fertile days. Another study with 51 participants shows that women reported being more attracted to someone who was not their primary partner on their fertile days.These participants also noted that their primary partners seemed more attentive and focused on them during their fertile days.

Another sign of ovulation that you might observe is a change in your vaginal discharge (cervical mucus). During ovulation, vaginal discharge is often described to be like egg whites: clear and slippery to the touch. You may notice having more discharge than at other times in your cycle.

Some people also experience symptoms similar to those that they experience during their period such as breast tenderness. That pain on one side of your lower abdomen that shows up in the middle of your cycle (14ish days before you bleed)? It's called mittelschmerz, and it's not totally clear why it happens — it could be the egg enlarging right before it's released from the ovary, or maybe it's blood emerging from the ruptured follicle. Not everyone who ovulates experiences mittelschmerz, and not everyone who does gets it every month. Some people have bleeding and nausea along with this pain. You should talk to your doctor if your mittelschmerz is particularly bad.

Ovulation and fertility

Unlike an egg which is only fertile for 12-14 hours, sperm can survive inside the uterus for up to six days after unprotected sex. During ovulation, the mucus covering the cervix is thinner and easier for sperm to make their way through to reach the uterus. The first sperm make their way up the vagina, through the cervix and uterus, and into the fallopian tubes within minutes of ejaculation (minutes!). However, sperm will continue to make their way toward the fallopian tubes over the next six days. For this reason, about a week of each cycle is considered to be a fertile week. If you have sexual intercourse anytime in the week before your egg releases, you have a much higher likelihood of getting pregnant.

Ovulation tests

Unlike your period that announces itself with blood, it’s hard to know for sure if you are ovulating.

Ovulation tests, like the Modern Fertility Ovulation Test, work by telling you when you have had a surge of luteinizing hormones in the days before ovulation.
Our Ovulation Test helps you pinpoint your luteinizing hormone (LH) levels to predict your 2 most fertile days.

With our test you’ll get more insight than just a positive or negative result — you’ll be able to see your LH change daily and track low, high, or peak levels. This is key for understanding whether you're in your fertile window and approaching ovulation (when you have the highest chances of pregnancy).

It also works like magic with our free app to help you track your LH levels and find your two most fertile days so that you can predict ovulation.

How the Modern Fertility Ovulation Test works
With our Ovulation Test, you can track your low, high, and peak LH levels so that you can predict your 2 most fertile days and get in sync with your cycle.

Yes, we’re hormone nerds — and we’re proud of it

Our mission is to make personalized fertility information more accessible through at-home tests and digital tools. In addition to our Ovulation Test, we have:

  • The Modern Fertility Hormone Test, which measures the same fertility hormones that a doctor would test in a fertility clinic (for a fraction of the price) and helps you understand how your fertility is changing over time. Our hormone test gives you insight into the number of eggs you have and can help you identify red flag issues — like PCOS or thyroid conditions — that could affect your reproductive health down the line.
  • The Modern Fertility Pregnancy Test, which also works like magic with our app.
  • Our Modern Fertility Prenatal Multivitamin, which helps you prep your body now for pregnancy whenever. It's designed to support your body before, during, and after pregnancy with 12 essential, doctor-backed nutrients. It comes in a sustainable monthly subscription with a (beautifully blue!) reusable glass jar — meaning no more forgotten refills or empty plastic bottles.

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Louise Head

Louise Head, is a brown queer sex educator and associate marriage and family therapist. She also writes about sex and women's health for Modern Fertility!

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