Okay, so I've been seeing a lot of "am I pregnant" posts showing a dark line, and a very faint line next to it. All the coments say "Congrats you're preggers!" And such.

However: I've taken prehancy tests before... that looked EXACTLY like that. Dark line, suuuuuuper faint line. AND I WASN'T PREGNANT. So like, what's the deal? Now I'm like, what if they're not even pregnant either, and just got their hopes up because of dummies in the comments? Can someone please tell me EXACTLY how to read a pregnancy test and how you can be 100% sure. Because I always thought my tests were negative (must have besn because I don't have a baby), yet they looked identical to the tests people are calling positive on here.... explain?