FRER vs CVS (compare to First Response)

Patricia
Does anyone know if the real FRER is really more sensitive then generic that compares? I got BFN with it today and probably just hanging on to hope that the test wasn't sensitive enough. This is my 6th month and I always test early so can't do brand name every test!!!! Kinda figure preggo is preggo and would show up on any...😐😐