I bought some OPKs last month off ebay and this is my first time using them. I feel like I have read conflicting information about them.

I'm on CD11 right now, I started testing on CD8. According to my phone app, it says I won't be ovulating until CD15. I started early because I wanted to get the hang of it before the timing became crucial.

I've been testing every day, around the same time. The line has been much lighter than the control line, which is expected. But should it be getting darker as I get closer to ovulation? I feel like if anything, it's been getting lighter. Or did I just start testing too early?

I'm paranoid because after I ordered them I read about the counterfeit Wondfos. I just hope I didn't waste my money.