You can take the test 6 days in advanceThe Clearblue Ultra Advance is our most sensitive test, which means you can take the test up to 6 days before your missed period (ie 5 days before the expected day for your period) . Accuracy greater than 99% From the expected day for menstruation. Easy to useClearblue has an ergonomic design, including a longer curved rod and a wide color change tip.Our exclusive FloodguardTM technology helps to reduce the main cause reported as usage error2 and facilitates testing. Easy-to-read results Clear and simple results presentation; 2 lines if you are pregnant, 1 line if you are not pregnant.