Not sure what to think? :(

K
I have been having light positives for 6 days now. I woke up in the middle of last night and went pee and also drank half a bottle of water. I'm so upset because my tests haven't been getting dramatically darker in the first place and now it looks even lighter! The picture on the bottom of the first one is what they've been looking like. What do you ladies think? I'm 16 dpo today and I've been testing positive for almost a week now with light lines.