Took apart a first response digi and found a 2 line test strip

I'm 11dpo and I caved and took another test today, a first response digital test. the screen said negative, then I remembered reading a couple ladies got a bfn with those tests after getting bfps on other tests and they decided to take it apart and inside was a test strip that looks like the normal 2 line tests and I see a darker line, definitely not an indent, as this one had color. Still a very faint line though.. anyone else do this??