Clearblue Digital Pregnancy Test with Weeks Indicator is the first and only test that is as accurate as an ultrasound scan at dating pregnancy (1). Its smart dual sensor not only tells you in words on the digital display if you're pregnant or not, it also tells you how far along you are – weeks since conception are shown as 1-2, 2-3 or 3+. (2) With this home pregnancy test kit, you can test 5 days before your missed period (which is 4 days before you expect your period). 65% of pregnant results can be detected 5 days before your missed period. If testing before you expect your period, you must use your first urine of the day for an accurate Weeks Indicator result. (1) Weeks result 97% in agreement with later ultrasound dating scan. Based on studies of 187 women comparing result to ultrasound dating. The only test that tells you how many weeks!