If you did ovulate then I would say CD14, but your temps are so all over the place after this makes me think you haven't ovulated yet. This and the fact your lp would be rather long, which would be fine if pregnant obviously, but if I recall correctly you tested and had evaps? I would think if you ovulated CD14 you would have a fairly clear line by this point.
Having said this, I'm not familiar with the app you're using. I would say perhaps your body tried to ovulate but didn't, perhaps you will soon. How long are your cycles usually? Do you have any known issues?