Vvvvvvvfl turns dark after time frame

I have been getting so discouraged with the negatives ive been receiving on the internet cheapies. My husband and I decided to go to Big lots a get 2 different types. Red dye and blue (same brand just different dye colors). Red was negative. Blue was an extremely faint line within its 5 minute window. This was also at 6pm. As the night went on longer after time frame the line has gotten darker.

Has anyone experienced a faint line (in time frame) get darker after time frame?

P.S. yes i know not to rely on the test. I will be testing again in the morning to see if it got darker or not until AF shows.

I am genuinely curious.