Pt test check 5-10mins shows negative, we keep the test but after an hour it appears a faint possitive line and a week later it shows possitive, tested when 15days delay, doing another test on 28th, 23days delay. evaporation line? also stress month?

Are you referring to a home pregnancy test? Or, some other test? It is important that you follow the instructions on the package as to when to read the test result. The test needs to be read in the time period indicated, not days later. If this is a pregnancy test you are referring to, then see your doctor to confirm the test if there is any doubt. A blood test can be done to confirm the home test