Anyone always get Neg opk strip tests, but positive opks on clearblue digitals? Curious.

Ky 8-15-17👼🏼 & 10-28-17👼🏼 Pregnant with my🌈💕
I've been using cheapie opk wondfo strip tests and still have not gotten a positive. I thought for sure I was going to the other week ago because the lines were getting dark. I'm thinking about trying clearblue digital and maybe then I'll get a positive. Anyone else?