PP

Has anyone had a pink evaporation line on a pregnancy test? I took a test and after the 3 minutes it was negative, checked it about an hour later and there was a second pink line! But I took a test before that and afterwards which were negative, I've read online that evap lines are always grey or colourless and the only time a line will be pink is if it's detected hcg? Very confused, could I be pregnant? I'm due on tomorrow. thanks in advance for answers x silver or grey wears for cocktail party