Trying to will the line to show-line eyes

According to Glow, AF was due today. I started spotting four days ago, for 3 days. Got my hopes up that it may be implantation bleeding, especially after it stopped after 3 days (AF usually stays for 5). Took this test with FMU today, but I'm fairly certain it's a BFN...the more I stare at the inverted test, the more my mind tries to see the start of a faint line. I do drink a TON of water (between 90-130 oz./day), is it possible that even though this was with FMU it might be too diluted?