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.