Has anyone ever had this before? I got a clear strong positive on my first response OPK strip today and a slightly fainter positive yesterday but on both days my clearblue digital OPK was negative. I know you're not supposed to read the clearblue strips but I had a look anyway and the lines on yesterday's test looked stronger (when the first response one was lighter) and lighter today (when the first response was a strong clear positive).

Confused! Bought the clearblue digital for more accuracy in pinpointing ovulation but now I'm just confused.