Hey!! I keep going back and forth on mine. I'm not 100% sure where the nub is, or if it's even visible. I do have a straight line but it's not bright white. I also have "stuff" under the line. Which area is the nub? I'm also looking for guesses because I'm not great at this. I included a potty shot in comments. A nub does not show in potty shot, but I don't see lines or dots or any indicators either. Any guesses? Is it too early?