MY MIND IS TRIPPING! HELP

Ok so am not even trying to get pregnant at all and the whole idea freaks me out!

Aren’t we not supposed to be looking at a pregnancy test a day after it was taken? I keep going back to the tests that I have taken a day ago and seeing a very very faint line!! My period is due in 3 days I don’t know why I keep thinking that am pregnant I just cant 😩😩😩