How Accurate are First Response ER tests?

Jasmine

Hey guys!!! I took 2 FR ER tests & I got faint lines.. I know that the blue dye tests will give faints lines but not really sure about the pink dyes! I spotted on the morning of July 22nd and AF isn’t due until Aug 3rd! My nipples are hurting soooo bad today. I absolutely neverrrr spot. Can anyone tell me what they think about this test??