Hi dear. am happy that you are asking the question on a renowned public forum and I am sure you will get the perfect answer. I will share my experience with you. I had a lot of time on my hands last night and two EPTs, so I conducted my own science experiment. I took the first test and noticed the faint line. Then I took it out of the holder to get a better look. Realizing I broke 2 of the POAS rules (looking after the time limit, and taking out of holder) I decided I would use the second test as a control test to compare the first one too. So instead of using urine, I used water on test #2 figuring I would get the same line if in fact is was just an evap line. Test # 2 never showed anything. I hope my experience will help any woman reading it. Best of luck to all the pregnant woman in advance for their bright and healthy child. Happy motherhood to all. Be safe and stay blessed.