All pregnancy tests are not the same. First Response with patented ultra sensitive technology can detect very low levels of the pregnancy hormone, so you can know sooner. Pregnancy testing has evolved to become so sensitive that pregnancy can now be detected as early as 6 days before the day of your missed period (5 days before day of expected period)#. First Response Instream Pregnancy tests are easy to use and over 99% accurate†. You can test any time of the day and results are ready in 3 minutes. The sooner you know you're pregnant, the sooner you can take better care of yourself and your baby. First Response; let us tell you first.