Evaporation line or positive pregnancy test

[Missy1701]

4.5 months PP, tested this morning and line came back negative initially (less than the suggested 3 min wait) checked when back in the house and now positive. Retested and negative but don't know whether my urine is too diluted. Could this be an evaporation line?

Yes that looks like an evap line

So many people get evap lines on these clear blues after the time is up.
If white after 3 mins, I'd say negative.