How it works: Instead of testing for just LH, this urine test also detects another hormone, estrone-3-glucuronide (E3G). Clearblue says this additional hormone can help pinpoint four fertile days, while most digital tests just offer two. A flashing smiley face appears during the high fertile days leading up to ovulation and then turns to a solid smiley when you reach peak fertility. Those are your cues to get busy!
How accurate is it: According to Clearblue, it’s over 99 percent accurate at detecting that LH surge in lab studies.
Pro: It’s especially good if you’re a planner. Instead of just a day or two advance notice of your most fertile days, this test typically gives you a four-day window.
Con: Some users report that the tests sometimes show high fertility for up to a week, without switching to peak, particularly in the first month of use. It’s also not recommended if you have polycystic ovary syndrome (PCOS).
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