Lordy. Any quacks on here know if this would work or is it a scam? Does this sort of product need regulatory approval?https://twitter.com/DrDemography/status/1194751355627298816 …
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from the FAQs it sounds a lot like they're measuring urinary androgen metabolite(s), which is not very reliable (but I'm not expert at this either - @jeff_keelan ?)
The sex of the fetus has very little impact on maternal steroid hormone levels; steroid conjugation and excretion is dependent though on placental metabolism and renal function. IMO measuring urinary androgen levels provides ZERO insight into fetal sex.
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