Diluted urine=incorrect results?

💙𝒯𝒶𝒾𝓈𝒽𝒶🤰🏽🧜🏽‍♀️

So I've been doing my OPKs for the past few days. Glow has it looking like I'm making progress and I think I am. But I usually only test morning and evening (can't really do afternoon because of work). My other issue is that I only really drink coffee and water during the day, so I'm wondering if that's affecting my evening results. Anyone have any insight?