Fluctuations

Megan • We started our baby journey back in 2016. We spent 2 years trying to no avail- broken heart after broken heart lead us to fertility, where we were quickly told that our chances of conceiving naturally were under 2% due to male-factor infertility. But tha
So, I just started using OPKs a couple months ago. First round was with strips, and I had a hard time seeing a clear positive. Ditched the effort on CD15. Last month, I went digital and had 4 days of "high" and hit peak morning of the 5th day CD14. Kind of picture perfect, so I figured my body was doing what it was supposed to. This month, still flashing smiley on high for the 5th day in a row and it's CD17! My question is...do those of you who have used OPKs for a while with fairly regular cycles see fluctuations with your O times?