How Does a Clearblue Pregnancy Test with Colour Change Tip Work? 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. It stays at a higher than normal level for the rest of the pregnancy, and for up to 3 weeks after giving birth. The Clearblue Pregnancy Test with Colour Change Tip works by detecting the pregnancy hormone in your urine and is over 99% accurate when used from the day your period is due. You can use it up to 4 days before your period is due but if you get a 'Not Pregnant' result, you should test again when your period is due. The levels of pregnancy hormone in your urine may not be high enough to be detected yet. The Colour Change Tip and the control window give you extra reassurance by showing you that the test is working. The result window will give you a clear (+) result if you're pregnant and a clear (-) result if you are not pregnant.
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