I took a pregnancy test WAY early - First Response. Neither line showed up, so I put the stick away in case the whole box is full of duds. Few hours later, there were two super-faint lines. So I got an EPT test. Lines showed up like normal, but not pregnant.

I don't plan on testing again until my period is late, but now I'm curious. Are First Response more sensitive than EPT? When not duds - I know the First Response one was faulty.