This is to follow up on first question titled faint line. I had another preg test that I took 4 days after first one showed faintest line. It showed no line. I also had this 2nd test out of the foil for 4 days because I wanted to compare it to first one to see if my eyes were fooling me on the faint pink line. Why would this happen and can leaving test out of foil mess test up. I read somewhere where it possibly could. Any suggestions. I don't start period for another 3 weeks. Thanks