Evaporation Line??

Twice po ako nag pt.. pareho pong naglabas ng faint line.. yung first.. within 5 mins nakita ko yung sa test line.. yung 2nd pt .. control lang nkta ko within 5 min. But after non, lumabas yung faint line ng test line!! Evaporation line daw po pag grey color.. pero pink po yung line..