This doesn’t make any sense?

So I’ve been reading through this forum and what I am gathering is that I shouldn’t trust at home urine tests? I’ve always been taught the opposite in like school in stuff.. but so many people on here say that they where wrong. So what do I do? I’m a couple of weeks late and had to get a friend to get me tests and they are all good tests. All are negative but my period is still not here. But everyone said they can be wrong ? What do I do now!