OPK confusion!!! Please help

So I'm a newbie to opk'S and I'm really struggling so far with them and SO tempted to throw them out the window!!

Usually, my cycles are 30 days. I've never known when I ovulate however since a miscarriage in September my cycles have been 35, 37 so really wanted to be in tune with my body this month hence the opk'S

What are my results looking like??

I originally thought CD 12 was a positive test and I was expecting the test line to therefore fade. However it's not? Is something wrong? Is CD not a positive aftersll? Please help!