Ovry® Ovulation Test Strips help detect your two most fertile days of the month with over 99% accuracy. Knowing when you ovulate increases your chance of conception when trying to conceive. When trying to avoid pregnancy, ovulation testing improves cycle monitoring and empowers you to take charge of your fertility.Each box includes a FREE cycle tracker and Ovry tests are compatible with all test-interpretation and cycle tracking apps, including the Premom App.Ovry Ovulation Test Strips work by detecting luteinizing hormone (LH) in urine, which spikes before an egg is released by the ovaries. A positive Ovry Ovulation Test indicates that an LH surge was detected and that for most women, the greatest likelihood of conception will occur throughout the next 48 hours.