How common are evaos on cheap ICs

[ColeCaden]

Hi im due AF on Friday and have been testing for days however today on an IC ive gotten a faint 2nd line. Im so anxious thats its an evap line and just wondering if others had had the same experience. I know I should really re test again with a frer but ive none in the house at the minute and dont really want to waste my money if its just an evap line. Tempted to order more cheapies online but dont know if i can wait til the delivery date lol