help evaporation or positive line

hi everyone im new to this so i was wanting a little help i did a pregnancy test about 3 days ago which was 10 days before my period and i got what looks like a positive ( bottom test) with all the excitement i got a clear blue yesterday 8 days before my period is due and got a negative result i then did the same band test that i did the first time and another line came up i was told and evaporation lines and im not completely confused as to if its an evaporation line or if it is actually positive thank you