I took 2 Answer brand OPKs- one stick and one cheap strip, with the same pee at the same time. The stick, which have always worked well for me in the past is negative - no doubt. The cheapie strip is very +. Isn't this weird? The same brand giving me 2 different results?
The CBE digital I also took with the same pee is so sexytime it is! Just thought that was weird and I'm glad I took 3 tests! LOL
Re: AAK! One +, one - OPK
Maybe since you had a + and a the one you had that was - was just a dud. It happens!
Good luck, and BD-a-plenty!