What does a faint line on an ovulation test mean?

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Got a faint line on an ovulation test and wondered what it meant? You’re not alone.

Reading a pregnancy test is simple. If two lines pop up, no matter how light or dark they are, you’re pregnant! Easy, right?

But ovulation tests are another story. That’s because pregnancy tests and ovulation tests don’t work the same way.

Pregnancy tests detect the human chorionic gonadotropin (hCG) hormone. Your body only produces hCG when you’re pregnant.

But ovulation tests measure luteinizing hormone (LH). And your body produces LH throughout your menstrual cycle. That’s why seeing two lines on an ovulation test doesn’t always equal ovulation. 

So if you got a faint line on an ovulation test and are feeling confused, you’ve come to the right place. 

Read on to learn what a faint line means, why it happens, and the best way to tell if you’re really ovulating.

How Do Ovulation Tests Work?

Ovulation Tests

Ovulation tests, or ovulation predictor kits (OPKs) measure how much LH is in your urine. During most of your cycle, LH is present at low levels. 

But around 24-36 hours before ovulation, LH surges. This surge triggers your ovary to release an egg into your fallopian tube. 

And if you time it right, the egg may be fertilized by a sperm. 

While sperm can remain viable for up to 5 days, an egg can only survive around 24 hours. 

That means your fertile window consists of 6 days: the 4 days leading up to ovulation, ovulation day, and the day after ovulation. 

fertile window

And that’s where ovulation tests come in. Since they help predict ovulation, they can tell you the best time to head to the bedroom.

The thing is, by the time you get a positive ovulation test, much of your fertile window has passed. That’s why some advanced tests measure estrogen as well. 

Around 5 days before an LH surge, estrogen rises. When you see estrogen climb, that’s your sign your fertile days are approaching – so prepare to get busy! 

fertility window chart

The more you have sex during your fertile window, the better your chance at conception.

And while ovulation tests help with conception, reading these tests isn’t always so easy. 

How to Read an Ovulation Test

Like pregnancy tests, ovulation tests have two lines: a control line and a test line. 

The control line just shows you the test is working. If the control line is missing, the test is defective. Toss it and take another test.

The test line is what gives you your result. For a positive ovulation test, the test line must appear the same color or darker than the control line.

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If it is, it means your LH is surging and you can expect to ovulate within 24-36 hours. 

But it’s not always that simple. For example, what if the line is faint on an ovulation test? Let’s cover this next.

What Does a Faint Line on an Ovulation Test Mean?

Faint Line on an Ovulation Test

A light line on an ovulation test means some LH was detected, but it’s not high enough to suggest an LH surge.

As you approach ovulation and your LH continues to rise, the line will darken. After the surge, LH will fall back to its baseline levels.

During a normal menstrual cycle, a faint line could mean a couple of things:

  • You’re in your follicular phase and approaching ovulation. In this case, your LH is rising, and the test line will continue to darken as your body prepares to drop an egg.
Faint line in follicular phase
  • You’re in your luteal phase and ovulation has already passed. In this case, your LH is falling, and the test line will gradually appear lighter each day.
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If you get a faint line, try not to stress. Just keep retesting each day and compare your results. 

To avoid missing the surge, it’s crucial you test twice a day. This is because LH surges vary widely by the onset and pattern. The next section will help break this down…

Different Types of LH Surges

Most people think all LH surges are over within a day or two. But that’s not always the case. 

Roughly 43% of women have rapid surges that are over within a day. If you’re one of them and you test once a day, you could miss the surge – and your chance to get pregnant that month.

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Learn More: LH Level & Surges: What’s a ‘Normal’ LH Level Look Like?

Around 57% of women have gradual onset surges that happen over 2-6 days. In this case, if your LH levels are lower than the norm, you could get faint lines indefinitely.

Gradual lh surge

Surge patterns are also unique. According to one study:

  • 48% of women have single surge patterns with one LH spike.
Single surge lh
  • 33% of women have biphasic surges, where one LH spike is followed by a second. 
biphasic surges
  • 11% of women have plateau patterns, where an LH spike remains high for several days. 
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  • 8% of women have multiple surges with more than two LH spikes.
New Multiple LH surge
If your LH levels tend to be low and you have several spikes, the faint line may appear darker one day, then lighter the next. This flip flopping may continue depending on the number of LH spikes you have. 

Clearly, if you’re trying to get pregnant, this can be incredibly frustrating. You may keep testing, waiting for the green light to have sex, and never get it. 

But there is a solution – more on this later…

What If I Get a Faint Line on an Ovulation Test for 5 Days

Faint Line on an Ovulation Test

If you’re getting faint lines on an ovulation test for 5 days or more, there are a few possibilities. And it may be as simple as switching to a more sensitive test. 

Most OPKs base their results on average thresholds. If your LH meets that threshold, you get a positive result.

This works fine if you’re someone with average hormone values. But if your LH levels tend to be lower than the norm, you may keep getting faint lines, even ovulation occurs!

So if you keep seeing faint lines for days on end, try taking a quantitative test that measures your actual hormone levels. 

That said, there are certain situations that can cause low LH levels, which may lead to faint lines, including:

  • Malnutrition or eating disorders: Your body needs the proper nutrition to produce hormones.
  • Overexercise: Intense exercise increases cortisol production, which can throw off hormones.
  • Pituitary gland problems: Endocrine imbalances and certain tumors can weaken your LH production.
  • Extreme stress: Chronic stress raises cortisol, which hinders your fertility.

If you keep seeing faint lines and suspect your LH is lagging, speak with your doctor. They can help create a treatment plan to get your LH back on track. 

What Does It Mean If There’s No Second Line on an Ovulation Test?

No Second Line on an Ovulation Test

It depends on the line that’s missing. If there’s no control line, the test is faulty, and you should throw it out.

If the test line is missing, it means no LH was detected and you’re not close to ovulating. You may have miscalculated your ovulation day – which is fairly easy to do.

Ovulation commonly happens 12-14 days before your next expected period. But that can differ if you have irregular cycles.

Learn More: Early Ovulation: Why Do I Ovulate So Early in My Cycle? 

One study found ovulation may occur anywhere between 7 to 19 days before your next period. Your ovulation day can vary from month to month as well. Tracking your ovulation each month can help you zero in on your ovulation day patterns, so you know when to test.

Learn More: When is the Bests Time to Take an Ovulation Test?

If you’ve been taking ovulation tests for several months and still haven’t seen a positive result, it’s best to contact your doctor. 

Can You Get a Faint Line on an Ovulation Test and Be Pregnant?

Yes, it’s possible!

As mentioned, pregnancy and ovulation tests measure completely different hormones. Pregnancy tests check for hCG, while ovulation tests detect LH. 

After ovulation, LH falls. If conception occurs, your hCG starts climbing. But your LH remains low throughout your pregnancy. 

So if you’re pregnant, it’s unlikely your LH would be high enough to see a faint line.

The thing is, hCG and LH are very similar in structure, and may cross-react on some tests.

LH and hCG are both made up of beta and alpha subunits. Their alpha subunits are identical. Their beta subunits are what give each hormone its unique characteristics. 

Ovulation tests that measure alpha subunits may pick up on hCG and read it as LH. So if you take an ovulation test while you’re pregnant, you could get a faint line due to cross reactivity. 

Does a Positive Ovulation Test Mean You Really Ovulated?

No, not always.

There are certain situations that can cause high LH levels, even if ovulation doesn’t occur. This includes:

  • Polycystic ovarian syndrome (PCOS): This hormonal imbalance is common in women during their reproductive years. Women with PCOS tend to have high LH levels yet have problems with ovulation. 
  • Perimenopause: During perimenopause, estrogen and progesterone decline, while LH increases.
  • Fertility medications: Some fertility drugs are given to trigger ovulation. This may cause high LH levels, even if ovulation never occurs.
  • Luteinized unruptured follicle syndrome (LUF): In this condition, the follicle doesn’t open to release the mature egg. Women with LUF may have an LH peak, yet ovulation doesn’t occur.
  • Anovulation: One study found that around 18% of healthy women may have anovulatory cycles, meaning ovulation doesn’t happen. Anovulation can occur even if a surge is detected. 
    Learn More : Anovulation: Everything you need to know about the #1 cause of infertility

If you struggle with any of the above and take an ovulation test, you may get a false positive. Luckily, there is a foolproof way to confirm you ovulated. 

What’s the Best Way to Tell That You Really Ovulated?

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Spoiler: it’s not LH. It’s progesterone.

The LH surge triggers the ovary to release an egg. But it doesn’t confirm ovulation actually happened. Progesterone does. 

After ovulation, your progesterone begins to rise. This causes the uterine lining to thicken, to support a possible pregnancy. 

Learn More: What Your Progesterone Levels Mean After Ovulation

So, if progesterone increases after an LH surge, you can rest easy knowing ovulation occurred. 

Anovulation charts

Inito is the only fertility monitor that measures estrogen, LH, progesterone metabolite PdG, and FSH on a single test strip. This helps identify your unique hormone trends and to give you the best gauge of all your fertile days. That way you don’t miss a moment of peak fertility. 

But measuring these hormones also confirms you’re really ovulating, which OPKs can’t do.  

Also, Inito is a quantitative test. This means it measures your actual hormone values, without relying on thresholds. This can be a game-changer if you have irregular cycles, or if your hormone levels fall outside the norm.

Plus, Inito is digital, which makes the reading of the results crystal clear. The results tell you whether it’s a high or peak fertility day, so there’s zero guesswork involved. 


  • Luteinizing hormone (LH) surges 24-36 hours before your ovary releases an egg. 
  • Ovulation tests measure the levels of LH in your urine to predict when ovulation may occur.
  • To get a positive ovulation test, the test line must be the same color or darker than the control line.
  • If you see a faint line on an ovulation test, LH was detected, but either hasn’t spiked yet or already passed.
  • If you test too early, too late, or have lower LH levels than the norm, you may see a light line on an ovulation test for several days.
  • Many women have rapid LH surges that happen within 24 hours. It’s important to test twice a day to prevent missing the LH spike. 
  • PCOS, perimenopause, and certain fertility drugs may cause false positives on ovulation tests. 
  • Inito measures estrogen, LH, progesterone metabolite PdG, and FSH. This gives you the complete picture of your fertile window and confirms ovulation.
  1. Artal-Mittelmark, R. (2022, February 22). Physiology of pregnancy – gynecology and Obstetrics. Merck Manuals Professional Edition. Retrieved March 17, 2022, from https://www.merckmanuals.com/professional/gynecology-and-obstetrics/approach-to-the-pregnant-woman-and-prenatal-care/physiology-of-pregnancy 
  2. Bashir, S. T., Gastal, M. O., Tazawa, S. P., Tarso, S. G., Hales, D. B., Cuervo-Arango, J., Baerwald, A. R., & Gastal, E. L. (2016). The mare as a model for luteinized unruptured follicle syndrome: Intrafollicular endocrine milieu. REPRODUCTION, 151(3), 271–283. https://doi.org/10.1530/rep-15-0457 
  3. How to use Ovulation Kits & fertility monitors. American Pregnancy Association. (2022, January 6). Retrieved March 7, 2022, from https://americanpregnancy.org/getting-pregnant/infertility/ovulation-kits/ 
  4. Kumar, P., & Sait, S. F. (2011). Luteinizing hormone and its dilemma in Ovulation Induction. Journal of Human Reproductive Sciences, 4(1), 2. https://doi.org/10.4103/0974-1208.82351 
  5. Mesen, T. B., & Young, S. L. (2015). Progesterone and the luteal phase. Obstetrics and Gynecology Clinics of North America, 42(1), 135–151. https://doi.org/10.1016/j.ogc.2014.10.003 
  6. Miller, P., & Soules, M. (1996). The usefulness of a urinary LH kit for ovulation prediction during menstrual cycles of normal women. Obstetrics & Gynecology, 87(1), 13–17. https://doi.org/10.1016/0029-7844(95)00352-5 
  7. Vitale, S. G., La Rosa, V. L., Petrosino, B., Rodolico, A., Mineo, L., & Laganà, A. S. (2017). The Impact of Lifestyle, Diet, and Psychological Stress on Female Fertility. Oman medical journal, 32(5), 443–444. https://doi.org/10.5001/omj.2017.85

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