This easy to read Clearblue Digital Ovulation Test the only test that tells you how many weeks, only test to typically identify 4 or more fertile days when you have the best chances to get pregnant naturally There are only a few days each cycle when a woman can conceive, the days leading up to and luding the day of ovulation. But cycles are variable and so is the timing of ovulation, which means that 1 in 2 women could be trying to conceive at the wrong time of the cycle(1). These simple urine tests are over 99percentage accurate at detecting the rise in a key fertility hormone (luteinising hormone) 24-36 hours before ovulation. A clear smiley face appears in the digital display when your LH surge has been detected, so you know this day and the following day are your best 2 days to try for a baby. (1)Johnson SR., et al. Hum. Repro. (2011) 26: i236. For more information on this product or answers to your questions, our Careline advisors are available for you from 4pm – 12 midnight Winter, 6pm – 2am Summer, AET, (may vary due to daylight saving), Mon - Fri except on bank holidays.