The Clearblue Early Detection Pregnancy Test allows you to test for pregnancy up to 6 days before your missed period (5 days before your expected period). It is over 99% accurate from the day of your expected period. The test detects the pregnancy hormone hCG with a sensitivity of 10 mIU/mL, enabling early detection. In clinical testing, it detected 71% of pregnancies 6 days before the missed period, increasing to over 99% on the day of the expected period. ​