evaps?

I took a test (88 cent Walmart) and nothing showed in 3 min window. I looked again a little later and there was a pink line! Obviously there. 
I think if I'm pregnant I implanted late. Had spotting 3 days before AF due, starting Dec 8th-11th and have had symptoms since. 
I took test Saturday. I am going to retest Friday with FMU (Thursday will mark two weeks since I started spotting) hoping for BFP
My question is, I thought evap lines are grey? I know I have to retest anyways to be sure but could this be promising? 
Next AF due Jan 2. 
I just feel pregnant... like intuition. Anyone else have similar experience?