Get Pregnant Sooner1—Know Your Two Most Fertile Days!Maximize your chances by accurately predicting your most fertile days, so you can make the most of your prime conception time.Test Early, and Test ConsistentlyThe best time to start tracking your cycle is before you start trying to conceive. Your two most fertile days begin with the LH surge. You are most likely to get pregnant if you have intercourse within 24-36 hours after you detect your personal LH surge. It's important to test consistently each day so you don't miss your LH surge.1 Based on directions for use of Ovulation test.