Clear Blue Digital Pregnancy Test Kit With Conception 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', also tells you how far along you are. 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 Conception Indicator is 93% accurate in detecting when you conceived. If you're testing from the day of your expected period, you can test at any time of the day. If you're testing early, use the first urine of the day. Clearblue Digital Pregnancy Test is more than 99% accurate in laboratory tests, when used from the day of your expected period. If you are testing before the day your expected period, the accuracy will be lower. In pregnancy, hCG is produced first by the fertilised egg and later the placenta. A fertilised egg typically implants into the lining of the uterus (womb) 6-8 days before the missed period, when tiny amounts of hCG start to appear in the mother’s blood and urine. Though hCG levels are very low at first, the level rises rapidly and predictably in the first weeks of pregnancy. The earliest you can test with the most sensitive tests currently available is 6 days before your missed period (typically 10 days after ovulation). All Clearblue pregnancy tests are designed with women in mind, and include unique and innovative features to make them easy to use and easy to read, so you can be confident in your result, helping reassure you when you need it most. Clearblue has been a pioneer in pregnancy testing for over 30 years, delivering new and innovative products.