Does anyone have expereince with FR ov tests? Need some help!!!

[Angelfifi]

Hi,
Just wondered if anyone has used the FR ov tests? I'm not sure i'm reading mine right!! I have been testing for 5 days firstly i had a really really squint to look faint line then i have had for the last 3 days a very clear line but not as dark or strong as the control line and today i am back to the very faint squint to look line. Does this mean i ov'ed? It would be the right time for me to ov but as the test line wasn't the same as the control line wondered if this was a positive result!!
Any insight would be good!
Thank you.

Thank you londonlottie
No i'm not temping at the moment, and think if thigs don't happen this month i will try th clear blue digis at least like you say theres no confusion!!
It's all so complicated this ttc lark! Do you temp as well?

Has anyone else had experience with opks? Wondering is it positive or not?