Evap?

Anna
Took a test & I thought I seen a line opened it and all I could see was a faint faint line so I left it for like 4 hours came back & seen this could it be my Bfp ? Been having brown spotting for 4 days. What do you think? I'll add the picture when I first took it & the test after. But I heard that lines darken Once they dry?  Thanks 
First picture 5minutes after 
4 hours later.

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