Indent line

Okay so I'm officially 8 days late, my breasts are absolutely killing me today decided to finally take another test. An indent line popped up immediately, or at least im p sure it's an indent line, it's like white/shimmery. My back cam only works in black and white and this was the best picture I could get. I'm gonna test again in probably the morning tbh, but I wanted thoughts.

And, when an indent line is so quickly visibly, does that make the test invalid? Thank you!