Over 99% reliable From the day your period is due. The Ultra Early Test Digital Pregnancy Test from Clearblue is the most sensitive digital pregnancy test and detects the pregnancy hormone hCG with a sensitivity of 10 mIU/ml. Ultra Early results 6 days before your period is due (5 days before your period is due). 78% of pregnancies can be detected 6 days before the missed period, 93% of pregnancies can be detected 5 days before the missed period and 99% or more can be detected 4 days before the missed period. Ultra Clear Digital "Pregnant" or "Not Pregnant" result in words for more confidence in an early result. Ultra easy to use Clearblue's Ultra Early Test Digital Pregnancy Test offers an easy to hold, ergonomic design with an extra wide test tip for easy sample collection and a unique stop light that flashes when enough urine has been collected from the test tip. Our Floodguard technology helps to reduce user error and the Smart Countdown is displayed during testing to confirm that the test is analysing and to show the time to a clear digital result in words.