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Are u holding ur urine or continuing to drink a lot? Which tests r u using? Ur tests may not be as sensitive as u need, but yes, it doesn't need to get progressively darker, it really can go from nothing to surge in a matter of hours. There's also a possibility that u don't process hormones into ur urine efficiently. This doesn't mean it's not in ur blood and u won't/don't O. Consider tracking temps next cycle. It won't help foresee O, but can confirm if it's happened and when. That way ull know if u just don't have urine surges or truly aren't O'ing.
Good luck! =))

Most dont get a positive until 12-36 hours before they ovulate. You are only CD13, so I wouldn't worry at this point. You may have a short surge, or you may not ovulate until later in your cycle.

I have had cycles where it is CD 19 before I get my surge. I would go back and forth between no lines and faint lines until the day of the surge. My guess is that you have not ovulated yet.

Ok, so I did my afternoon opk, and I can see a faint line, obviously it's negative, but I'm glad to see a faint line, but now I have another question, is it normal for the cobtrol line to be much more faded than usual? Thanks for all your replys, hope you can answer me this question too BABYDUST :)

Depends on the test, they all have a certain amount of dye that is shared between the test and control line. Ur control *could* be a bit light becuz u actually have somewhat of a test line now, dye that otherwise may have went to the control. Hard to say for sure...not a big deal tho.

Thank you for all your help, but OPK seem so confusing for me, is it normal to get a positive Opk in the afternoon, ut almost positive at night??