Clearblue Ovulation Test... Help

Help me.......

I have been testing with “Clearblue ovulation test” (digital) since CD12 until today CD16, and still didn’t get a positive peak (LH surge).

I have been testing everyday in the morning approximately at the same time.

My menstruation length is normally 30 days, and I had my period last the 14 th of September.

The last 3 days I was having some little cramps in my lower stomach and back. Plus yesterday night some white discharge, and it stopped directly.

Should I keep on testing?

Did I maybe ovulate before CD12? Is that possible??