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When you become pregnant your body starts to produce the pregnancy hormone, human Chorionic Gonadotrophin (hCG). The amount of hCG in your body doubles approximately every 2 to 3 days, and reaches a maximum at around 7 to 12 weeks into the pregnancy. Clearblue pregnancy tests work by detecting the presence of hCG in your urine. All Clearblue pregnancy tests are over 99% accurate when used from the day your period is due. Clearblue Pregnancy test is so sensitive you can test early. All Clearblue pregnancy tests can be used up to 4 days before your period is due.