Will First Response for sure pick up 5 days sooner than expected period?


I am so anxious. My period is due 2/18 but my sister in law is saying I should test tomorrow but I don’t wanna drive my crazy (I will be doing so either way) and just test on 2/18 or see if I miss it and def test 2/19. I hate this wait game but is it worth it to test tomorrow with the 5 days sooner test?