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If you’ve been trying to get pregnant, chances are, someone has probably told you that using an ovulation test kit, or ovulation predictor kit (OPK), is the best way to help figure it out. Essentially, an ovulation kit takes the guesswork out of when your fertile window might be — or, in other words, when the best time is to get it on.
Unlike tracking your temperature daily, or (even more fun) checking your cervical mucus, an ovulation kit will tell you more clearly whether those little eggies of yours are getting ready to be released and meet sperm. After peeing on one, the test measures your Luteinizing Hormone (LH) levels to see if you experience a surge. While you’ve always got LH hanging out in your body, you experience a sharp increase (up to 5x your normal amount) a day or two before ovulation.
Your fertile window, or the best time to have sex to get pregnant, is 12-36 hours before the start of the LH surge, and when your egg is released. The general rule of thumb is to have sex at least once within 3 days of getting a positive result.
So, which ovulation test is the best for you? There are tons out there, but we’ve broken down the deets so you can make an educated decision.
The Best Ovulation Test Kits of 2021
If you want to get super serious about understanding your cycle, the Mira Plus Fertility Tracker is one of the best digital ovulation tests out there. This bad boy is LEGIT—measuring your LH and E3G (how estradiol metabolizes in urine) to a degree that was found by hospitals as equivalent to leading lab grade readers. That’s pretty precise.
What makes it unique
Mira provides actual mIU/mL concentration levels to predict ovulation and sends this data directly to the corresponding app without any manual data entry. If you’re having difficulty pinpointing exactly when you ovulate, this is truly the most modern and precise ovulation tracker we’ve seen, providing a window of up to six fertile days.
In our opinion, the Mira Fertility Tracker is really worth it. Digital ovulation predictor kits can really add up, so you might as well know that you’re getting the best. Plus, CoFertility warriors can score an exclusive 12% off their ENTIRE order for any Mira product —that’s almost $25 off a Mira Starter Kit or more than $10 off two boxes of wands! —using code COFERTILITY.
Oova’s ovulation test kit is LEGIT. Like, three-years-of-testing-at-NYC’s-Mount-Sinai-Hospital legit. This ovulation test contains 15 strips that check both LH and progesterone. Scan your test strip, and in seconds Oova will provide you with hormone concentration measurements down to two decimal places. The app also offers a personalized daily action plan, which explains what you should actually do with your hormone data.
Oova claims their tests confirm ovulation as well as a window of up to six fertile days. They also state that their ovulation kits are so accurate, some doctors are even using them instead of bloodwork and lab tests. We can’t confirm this, but it could certainly be worth a shot.
What makes it unique
One thing we love about Oova: their commitment to cost-consciousness. Oova recently lowered their pricing in order to widen access to their super precise ovulation tracking. Plus, the precision of fertility tracking technology may save you time and money in the long run.
Oova also claims that their app is the only one out there that allows you to share your hormone readings with your doctor in real time, which could potentially lead to fewer in-office bloodwork visits and earlier interventions for any unusual hormone fluctuations. Sign. us. up.
Oova is offering the CoFertility community 10% off using code COFERTILITY10. Check out the link below to score this deal!
Combine super-granular hormone testing with a user-friendly app, and you’ve got the Pearl Fertility ovulation test—one of the best out there. Pearl’s ovulation kit includes 15 strips to measure your hormones for early prediction of your fertile window, and its app allows you to upload photos of your strips for extra precise reading.
The kicker? You can score 10% off by using code COFERTILITY10 at checkout. Until Costco starts selling OPKs in bulk, we’ll be here, accurately checking our ovulation, while getting a solid 10% off. #winning!
What makes it unique
This app is awesome if your cycle is not your average, cookie-cutter, 28-day cycle. It’ll continue to update with each test and share your expected fertile window 5-6 days in advance.
You may have heard of Modern Fertility’s at-home hormone testing, but their ovulation tests are also super precise. As in, predicts-your-two-most-fertile-days precise. Their tests measure low, high and peak LH levels to give you the most accurate view possible into when you might be ovulating.
Even better, their ovulation predictor kits won’t cost you an arm and a leg. In one pack, you get 20 strips (we’ll spare you the math; at the time of writing this, that’s only $.80 per test), and if you buy into their subscription plan, you’ll save an additional dollar per order.
What makes it unique
Modern Fertility also offers a pretty awesome free app that allows you to scan your strips to track and predict your cycle. In addition to ovulation tracking, you can log periods, sex, or pregnancy tests — basically, all the important stuff.
We also love how Modern Fertility considers your overall fertility picture, versus just ovulation. If you’re confused about your ovulation tracking results or want more insight into your fertility health, you can check out their at-home hormone testing for more insight into things like ovarian reserve and other reproductive factors.
Plus, you can score an exclusive discount just for CoFertility users of $1 off each ovulation test — that’s over 6% off! — when you click our link below. You won’t find discounts on Modern Fertility ovulation kits anywhere else, so that’s a pretty decent deal.
Natalist makes, hands-down, the prettiest ovulation tests we’ve ever seen — but they’re also some of the best. Aside from their gorgeous packaging, Natalist’s ovulation tests also include instructions that are totally jargon-free, super clear, and include illustrations that walk you through everything. Since we’re big fans of anything that helps un-complicate the fertility journey, we’re v into that.
By using code COFERTILITY10 at checkout, you can score 10% off all Natalist products. Yep, that extends to their pregnancy tests, at-home sperm analyses, prenatal supplements, and more. This code is limited to one use per customer, though, so make sure to stock up before you check out.
What makes it unique
If you’re #ttc, you know that running through ovulation predictor kits with every cycle can reallllllly add up. We’ve always scratched our heads at why more ovulation test companies didn’t offer bulk pricing — until Natalist came along. At the time of writing this, you’re able to save when you purchase 4 boxes or 8 boxes of ovulation test kits. In our opinion, it could be really worth it to bundle.
This ovulation test kit is essentially foolproof. With this test, you’ll no longer have to squint hold the stick up to the light to decipher whether those lines are dark enough. On this test, a clear circle indicates low fertility, a flashing smiley face indicates high fertility, and a solid (non-flashing) smiley face indicates peak fertility or ovulation. It’s that simple.
This pack includes 20 strips for all you crazy testers out there. If you don’t reach peak fertility after one testing cycle, make sure to save your extra strips—you never know when you might need them.
What makes it unique
This test claims to be the only one that detects a surge in estrogen, another key fertility hormone that increases before your LH surge, in addition to measuring LH levels. It also identifies your 4 most fertile days, when most tests only show 2.
Proov claims to be a more accurate ovulation kit because it tests progesterone levels vs. LH levels monitored by other ovulation tests. While LH levels can predict impending ovulation, progesterone levels rise 24-36 hours after ovulation—and Proov touts that they’re the only test that can confirm whether or not ovulation has actually occurred. Monitoring progesterone is a double whammy, because if those levels remain elevated, that could be a sign of conception before taking a pregnancy test to confirm.
Either way, consider this a “double check” that may make the most sense to use together with another ovulation kit that measures LH levels. That’s why it’s called a confirmation kit.
Price varies whether you order a pack of 7 or 21 tests.
What makes it unique
Besides testing for a completely different hormone, folks love Proov because it reduces the need for some bloodwork. Rather than heading to your RE, this could give you a pretty good idea of your progesterone levels and/or whether you ovulated.
The more you know
Irregular cycles = more tests
Ovulation kits are awesome, but they aren’t the end-all, be-all when it comes to understanding your menstrual cycle and fertility outlook. If your cycles tend to be unpredictable, you may want to use a test with many strips, so you can start early and have enough if you ovulate later (or not at all).
False positives are possible
It’s possible to experience a false LH surge on an ovulation test, due to small LH peaks before the big kahuna. This is especially common among women with PCOS, so if you’re one of those special ladies, make sure to talk to an RE in addition to tracking at home, so you can get your timing totally right.
The ovulation test may not show a surge
There’s also a chance you may not experience a positive ovulation test at all. While this can be super discouraging, take action. Chat with an RE if you think there’s a chance you aren’t ovulating, and hopefully you can get back on track.
That said, it may be in your best interest to continue testing at home vs. only relying on doctor’s visits and bloodwork. While there’s definitely such a thing as information overload, ovulation kits can help you learn more about your cycle. That knowledge is invaluable.
Co's Picks for Best Ovulation Test Kits
FAQs about the best ovulation test kits
How soon after a positive ovulation test do you ovulate?
If you experience a positive ovulation test, you will likely ovulate a day or two later. An ovulation test measures your Luteinizing Hormone (LH) to see if you experience a surge of up to 5 times your normal amount. If you’re trying to get pregnant, the usual recommendation is to have sex at least once within 3 days of that positive result.
Which ovulation test is most accurate?
In our experience, the Mira Fertility Tracker is the most accurate ovulation test out there. It measures your Luteinizing Hormone (LH) to the exact mIU/mL concentration degree equivalent to leading lab grade readers. No blinking smiley faces or lines to interpret. It’s also super accurate because there’s zero manual data entry involved. The test automatically sends your data to its app, leaving pretty much no room for error. Yay!
What time of day is best for an ovulation test?
There is no best time of day to take an ovulation test, as long as you’re consistent — so if evening is best for you, make sure to test at the same evening time each day. Note that you should limit your fluid intake about 2 hours prior to testing so as not to dilute the amount of luteinizing hormone (LH) in your urine. This explains why many women prefer to time ovulation tests for when they first wake up, so they can use first-morning-urine, or “FMU.”
Are ovulation tests worth it?
We say, knowledge is power — so yes, ovulation tests are so worth it if you’re looking to get a handle on your cycle. Understanding ovulation and your overall cycle is pretty key if you’re trying to conceive, and we recommend using a combo of fertility tracking apps along with ovulation tests to make sure you know what’s really going on.
Can you get pregnant with a flashing smiley face?
There are no guarantees that an ovulation test with a flashing smiley face will promise a pregnancy, even if you have sex at that time. Plus, they’re all different — some will display peak fertility with a static smiley face, some with a flashing smiley face, some with dye lines…so if you’re trying to get pregnant, make sure you check the instructions for your ovulation tests carefully so you know how to properly read it.
Are ovulation strips accurate?
The most accurate way to test ovulation is via blood tests to measure hormone levels, vs. strips that may leave wiggle room for interpretation and error. That being said, ovulation tests are the second most accurate way of checking ovulation (vs. temperature tracking and checking your cervical mucus).
Why are my ovulation tests always negative?
If you’ve tested for a few cycles and your ovulation tests have always been negative, chat with your gynecologist or RE. There may be a few reasons why you aren’t ovulating, and your doctor may be able to help. The ovulation kits could also be negative because they simply missed your Luteinizing Hormone (LH) surge. If it’s a huge pain to head to your doctor, it may be worth taking a few more home tests to be sure you aren’t ovulating before making the trip.
How many days do you ovulate?
Ovulation typically lasts for about 24 hours (1 day), during which your ovaries release one or more eggs to potentially be fertilized by sperm. If you’re actively trying to conceive, experts usually recommend having sex at least once within 3 days of a positive test result.