Faint line or evap

Kt
Hi guys! I took a test and walked away from it (otherwise I sit and watch for the whole time haha) and I forgot about it. I've done that before and I come back and there's usually only one line. Even after the time is up.  I've never ever come back to two...I'm 1 day away from my missed period and saw this...faint line or evap? 

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