Please if you know anything about OPK or possibly not ovulating.. do you have any advice?

When should I expect my opks to get darker? I cant stop drinking water for 2 hours long enough to get a more accurate test result. Im so thirsty, drinking water alot is kind of "watering down" the test results if that makes any sense.. so im am not sure when I should start to see a darker line. Im due to ovulate on Saturday.

Ive had almost no symptoms of ovulation.. my right side is cramping up pretty badly but my breasts arent as sore as they usually are by this time. Worried I wont ovulate or atleast see a positive LH Surge test. Last month I didnt get a positive result like I had months leading up to that point. So I am worried i wont even ovulate as I have heard many women sometimes dont. Has anyone else experienced this before? Im so frustrated, I feel like my post isnt making any sense.