Have I missed my peak?

My premom and flo app tells me I'm due on my period on Sept 10th.. I've been having 25-28 day cycles.. so currently on cd15. Flo tells me I've ovulated 3 days ago, premom tells me its tomorrow but my LH tests have dropped down to 0.09 now and were darker a couple days ago.. Would you say I've ovulated already? Or can it rise again? Stumped!