Lines darker at night?

Laura

I took a test today right when I woke up and it was a very very faint line that I could barely see (first pic) then I just took one at 11pm and the line looks much darker! I honestly wasn't expecting it to be darker since I'm testing like a mad woman lately and thought the first Still could have been negative, but isn't it supposed to be lighter at night? Did anyone have this with their tests? I'm 9dpo based only on the app prediction and 3 periods tracked so I'm not sure how accurate that is. With my daughter I didn't test so much so I never saw the progression of lines day to day. Just not sure if that much darker is a normal increase at this early on, or if it's means something like twins. Second picture is morning test on top and 11pm test on bottom.