do all pregnancy tests pos and neg have a line?

Bridget
I am due to get my period in four days.. took three tests yesterday all with a very faint line. Took a digital test this morning at six which said "not pregnant". Took another test at about 9am which has another faint line. Picture attached. I know it's still early but is this faint line normal? Should I consider it a negative? It's barely visible 

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