All Clearblue® pregnancy tests are clinically proven to be over 99% accurate at detecting pregnancy from the day you expect your period1. However, if you think you might be pregnant, you want to know for sure as soon as possible, and many women want to test earlier than this. The earliest you can test with Clearblue® Early Digital Pregnancy Test and Clearblue® Early Detection Pregnancy Test is 6 days before your missed periods.