Pregnancy test confusion?

I’m sure I’m not the only one! I see loads of comments saying “I was showing negative test but dr said positive” or “ i didn’t find out I was pregnant till I was around 3 months so make sure” and things along those lines. So it really makes me question did these people take a faint test as a negative result? Maybe they didn’t wait the reading time frame? I feel like their comments make people even more stressed it makes me wonder because a pregnancy test taken correctly woth enough time after being sexually active (testing 3+ weeks) should be correct wouldn’t it? Like why comment stuff like that making people stressed if they tested correctly? Someone had commented about being late for more than 12 days or something like that and test were negative and she hadn’t been sexually active in more than 4 weeks and some girl was commenting like my sister in law was negative on home test when she really was pregnant. And like she was really pressing the subject like stressing this poor sis out. Based of the post her results are pretty accurate. Idk just ranting, it’s not the first time that I see this stuff happen. As I was scrolling on this late night and seen that I got so annoyed. Maybe cause she was really pushing it that these results can be wrong. I think at this day in age hcg home test are pretty damn accurate when taken correctly.