The way urine reacts to salt is a test for pregnancy
Home pregnancy test kits detect pregnancy by picking up on the presence of a hormone called human chorionic gonadotropin (hCG) in urine. Pregnancy can also be detected at the clinic using a blood test for hCG. The claim that pregnancy can be confirmed by the way salt reacts to urine appears to borrow elements from how home pregnancy test kits work. However, there’s no known mechanism by which salt reacts to the presence of hCG, and thus it isn’t a reliable method for confirming pregnancy. Factually inaccurate: There’s no scientific basis for the claim that the way urine reacts to salt can indicate pregnancy. As such, people shouldn’t rely on this "test" for accurate results. [...] However, this hasn’t stopped some people from promoting dubious tests on social media, such as by claiming that the way urine reacts to salt can confirm pregnancy. This particular claim has circulated on various platforms like Facebook and TikTok for at least the last few years (see examples here and here). More recent iterations of this claim include these TikTok videos—which received hundreds of thousands of views—and this Facebook post.