Digital pregnancy test does not have evap line. Positive pregnancy test is when there is color and evap is colorless.

Did you look closely. The no color faint pregnancy test line could be having light color. Just after the test evaporation line can occur if urine dried. A colorless line is evap. Take another test if not sure about the faint color of positive test.

Yes one can get negative pregnancy test for 55 days.

An evaporation line on pregnancy test is a colorless mark. Just like water crumbles paper after drying a wet paper. A faint positive pregnancy test has color unlike colorless evap line.

I think you are taking test too early ?, I was waiting for months. I got 55 days late period negative pregnancy test. So what should I do then if you are thinking this.

A one step pregnancy test evap line is also a random mark. It is just because you left it for long.

What is an evaporation line? An evap line a is a faint line or mark of urine. It is not positive even if you see color. You can make out the difference by looking at it. A positive result is clear and neat. It will be a long straight line. Evap line will not be clear straight.