First response test

Cynthia🐴 • Hunter- Jan 16, 2011 ❤ Addie- Feb 22, 2016💜
I bought the first response test that states you can test "6 days before your missed period" (AF is suppose to come on the 5th) I've been nauseous for a few days so I want to take one, but I don't know how accurate they are that early? Any experience?