I tend to think that if you keep getting faint lines you need to go see your GP. You shouldn't get an evaporate line within the specified time period, and any line at all shows that hcg (the pregnancy hormone is present). Tbh I've never actually had a dark line, so I wouldn't discount continued faint ones.
That's the problem with photos on computer screens, every screen has a different colour collaboration, resolution, contrast etc. So what one person sees will always be different to what another one sees, the difference is usually only subtle, but we're talking about a faint line here. I think if the OP saw the line then there is a line.
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