Need help!! New to this pol!!!

So I have been taken ovulation tests every 2-3 days even before my fertile period started because I recently started metformin so I don't know if my cycle will change! So all my ovulation a said I was ovulating (so I thought) the test lines were dark but not as dark or darker then the control line but today is my second day of fertile period aand the test line is almost non existant :/ does this mean I already ovulated ? This is my test today an I was pretty stumped !!  My older tests were away darker then that :/