Use up to 4 days before the expected period (In lab testing, 98% of pregnant results were detected the day before the expected period, 97% were detected 2 days before, 88% were detected 3 days before and 56% were detected 4 days before.) Rapid Detection Clear + or results Use up to 4 days before the period is due No 1 Doctor recommended brand No 1 brand most recommended in a survey of 401 doctors (2012) Designed to be the easiest to use, with 50% wider tip and shaped handle for easy sampling Weeks Indicator No 1 Doctor recommended brand No 1 brand most recommended in a survey of 401 doctors (2012) Easy to read digital results in words and numbers Displays unmistakably clear results in words and numbers Weeks since conception shown as 1-2, 2-3 or 3+ on screen The only test that tells you how many weeks