The Clearblue Pregnancy Test with Weeks Indicator is the first and only test that is as accurate as an ultrasound scan at dating pregnancy**. Its Smart Dual Sensor ™ not only tells you in words if you're 'Pregnant' or 'Not Pregnant', it also tells you how far along you are.So accurate... tells you how many weeks It's like 2 tests in 1 - it first detects if the pregnancy hormone is present with over 99% accuracy from the day of your expected period, and if you are pregnant, it ALSO indicates how many weeks since conception occurred 1-2, 2-3 or more than 3 weeks (3+). The Weeks Indicator is 93% accurate in detecting when you conceived.Can test 5 days early So sensitive you can test up to 5 days before your missed period*.Unmistakably clear digital results Within 3 minutes your 'Pregnant' or 'Not Pregnant' result in words will appear on the screen. If the result is 'Pregnant' the test will also indicate time since conception occurred (1-2, 2-3 or 3+ weeks).