The only pregnancy test that changes color to let you know it"s working. Missed your period? Think you might be pregnant? Clearblue Easy +/- Results Pregnancy Test can be used as early as 5 days before you expect your period. Over 99% accurate from the day of your expected period. The color sure tip changes color to let you know the test is working. Displays easy to read + or -. Results in just 2 minutes.