Confusion...Using opk for the first time!

So I'm using first response ovulation kit for the first time and I have been testing at similar times in the morning.

Wednesday morning had a faint reading, forgot to do it Thursday morning; but this morning (Friday) was stronger reading then Wednesday.

Then I read u can do it test twice a day but 10hrs apart, did another test 10hrs later today and it came up faint!

Now I'm just confused if I am or not ovulating, as there was a strong reading in the morning but not really by afternoon. Any advice/help for me?