I'm supposed to be ovulating?

So I am supposed to ovulate anytime from today until Saturday based on every single month of my previous cycles. My OPKS usually get increasingly dark every day I get closer however my OPKS are literally stark white. There's the faintest line. And I'm worried. I've never not ovulated before. And I have extreme left side stabbing cramps which usually indicates ovulation for me just not usually this painful. I temp, and track everything and use OPKS.