The Clearblue Advanced Digital Ovulation Test is a breakthrough: it is the only ovulation test that not only detects the rise in luteinizing hormone (LH) but also monitors the level of another key fertility hormone, estrogen, which increases in the days before the LH surge. Because your partner’s sperm can survive in your body for up to 5 days, you can become pregnant by having intercourse during the days leading up to ovulation. Show More Show Less
