Just like the title says. I'm 4 days late and had a pretty clear positive on a one step this morning, pink and everything, but a negative on a first response. Now I've had issues with frer before, but I'm at my wits end because I just don't understand why it's showing up negative when it should be MORE sensitive than one step? Are there any other pink dye tests that I can try? Or am I really not pregnant? I'm usually pretty regular with my periods.