If anyone know something pls let a comment

I’m 7 days late on my period and I’m having cramps for days now. At 3 days late I got a test (not in the morning ) which showed a faint line but this faint line disappeared in seconds. 3 days later I got another test (not in the morning) it showed a faint line. Today I got another one not in the morning again but it didn’t show anything. I’m going crazy, should I keep testing or all this shows something? I’m not in a position to have a kid rn and I can’t leave an appointment this earlier if I’m pregnant this is why I’m getting so nervous about all this.