Clearblue Pregnancy Test Plus. 1. Over 99% Accurate (from the day of your expected period). 2. Can test 5 days early: 5 days before your missed period is 4 days before your expected period. In lab testing, pregnancy detection rates were: 98% 1 day before the expected period, 97% 2 days before, 88% 3 days before and 56% 4 days before. 3. Result as fast as 1 minute (a pregnant result may appear in 1 minute when testing from the day of your missed period. Wait 3 minutes to confirm a not pregnant result. )