Hi this is my first month of using OPK so I’m not sure what I’m doing. Today is cd16 .....originally Glow estimated my ovulation cd13 but that got pushed back every day my opk was negative.

I tested 6am today before work and it was negative...,,,6:30pm after work was still negative but a darker line than I’ve otherwise had. I also had quite a lot of cervical discharge. But now it’s 9pm it’s back to undetectable again.

Could I have ovulated and missed a positive as I didn’t test for 12 hours? Or should I keep testing even though I’m cd16.

This is becoming more confusing day by day!!!