I need some more eyes!

Okay, I just took this test, and initially thought it was negative, but then I noticed the FAINTEST line and I don't know what to think about it. And yes, I know that everybody is gonna lecture me on not opening up my tests but I had to see if it was really there. I'm currently 15dpo, and af should have been here yesterday. Normally I would disregard a faint line, but it's like the same width and everything. I just don't know what's going on. Please help! Oh! And feel free to tweak! Thank you!