The Clearblue Advanced Digital Ovulation Test is an advancement: not only does it detect the rise in Luteinizing Hormone (LH), it also checks the degree of another crucial fertility bodily hormone, estrogen, which raises in the days prior to the LH surge. Due to the fact that your partner's sperm can endure in your body for as much as 5 days, you can in fact become pregnant by having intercourse throughout the days preceeding ovulation. By tracking these 2 vital hormones, this test is able to normally identify 4 fertile days leading up to, and including the day of ovulation, twice as numerous as any other ovulation examinations.