Clearblue Digital Ovulation Test typically identifies your four best days to get pregnant naturally. It accurately track two key fertility hormones, estrogen and luteinising hormone (LH), it identifies two peak fertility days, like all other ovulation tests, but also typically two high fertility days before that, so you have more opportunities to get pregnant. Its unique, smart algorithm adapts every time you test to indicate your personal wider fertility window. Have intercourse on high and peak fertility days to maximise your chances of getting pregnant naturally. The unmistakably clear Clearblue Digital smiley face will tell you when your body is ready. It is tested over 99% accurate at detecting the LH surge in laboratory trials.