? Need some help

Amelia • 23 • 🌈 16.3.2020 🥰🥰

Yesterday I took 4 pregnancy tests and they were all very very positive like the top test in this picture, the top test in this picture was taken last night at 6:30pm and this one on the bottom was taken at 6:30am 12 hours later? Why does it look lighter? Just a little worried that’s all