A woman can only become pregnant on a few days in her cycle. Therefore, sexual intercourse should take place on these days, if a pregnancy desire exists. With the Clearblue Digital Ovulation Test, you can maximize your chances of natural fertilization by determining the 2 most fertile days by measuring the increase in concentration of the major fertility hormone luteinizing hormone LH. This test is more reliable than the cycle calendar or temperature measurement method and shows clear results on a digital display. Normally detects 4 fruitful days. With this test you can determine more fertile days than with other ovulation tests. You have a better chance of getting pregnant.