HPT question

Bethany • mom to my rainbow 11/27/19 💙🌈

Can indent lines make a positive test line darker?

For example, I took one last night. Before I took it, there was a very obvious grey indent line. The test line was thin, faint, but pretty pink. Then, I took one this morning, and it was there, just not as dark and still faint. I’m not sure what group this goes in so please let me know if it belongs in a different group.