Ovulation Test Get pregnant sooner (Based on directions for use)! Predicts your 2 most fertile days. Over 99% accurate. No. 1 pharmacist recommended brand (Based in the Pharmacy Times 2008 Pharmacist OTC recommendation survey). Why test for LH surge?: Your two most fertile days begin with the LH surge. Therefore, you are most likely to become pregnant if you have intercourse within 24-36 hours after you detect your LH surge. LH surge: The presence of two similar pink lines means you have detected your LH surge. The test line may be darker than the reference line. No LH Surge: The presence of one line, or two lines with the test line lighter than the reference line, indicates that you have not yet reached your LH surge. This kit contains 7 First Response Ovulation Test sticks and instruction (English and Spanish). Laboratory testing shows that there are enough test sticks included in this stick for over 90% of ovulating women to detect their hormone surge. Not for contraceptive use.