The best or most fertile time to get pregnant is the period before and during ovulation. Luteinizing hormone in elevated quantities facilitates ovulation. During the rest of the menstrual cycle, only a small amount of LH is produced, but in the middle of the cycle LH briefly and dramatically increases. This increase is called the "LH surge" and precedes ovulation. Conception is most likely to occur within thirty-six hours following the LH surge. The LH Ovulation Test (ovulation predictor kit) is specifically designed to detect your LH surge - the time when you are likely to ovulate. Make love over the next 2 days following the first positive test result to maximize chances of becoming pregnant.