Lighter LH surge tests?!?!

I'm still trying to figure when im ovulating as this is my 2nd month ttc. I've been testing since cd9 as my periods are short(3days) and always have been. However my LH surge strips keep getting lighter to almost nonexistent. And overall I'm feeling blah and exhausted. Any thoughts on why they'd be getting lighter then darker? Worried I'm not going to O. Any input appeeciated!!!!