To be or not to be - pregnant?

I did an early pregnancy detection test on thursday <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>, and got a faint line. This morning, on saturday I did an "normal" pregnancy test, and it showed negative. My periods should start on tuesday next week. So what do you guys think, yet another month of dissapoinment ahead?