Is this positive opk?

Shikha

I have been testing opk since cd8 and this is what I have got at cd12. Should I consider this as positive? <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> says negative, don’t know why. I am 39 and ttc and pretty much regular with periods with cycle varying between 26-28 days. Plz help. This is so confusing