There are two days during your cycle when you are most likely to conceive. Our advanced ovulation tests help you determine them. In fact, they're over 99% accurate in laboratory studies at detecting the luteinizing hormone (LH) surge in your urine just before ovulation occurs. You are most likely to get pregnant if you have intercourse within 24-48 hours after you detect your LH surge. By helping you determine your peak fertility days, you can count on Coretests® LH Ovulation Test to help you get pregnant sooner.