LH fluctuation?

Roslyn

I am not expected to ovulate until later this week (Thursday), but I’ve been doing OPK tests twice a day for the last few days because I’m trying to get a more accurate understanding of when I ovulate (2 months TTC). My results have fluctuated quite a bit. It seemed to be getting darker until Aug 15, and then it’s been getting lighter since then. Is that fairly normal? Like is it possible that my LH will surge again?