Crappy hcg tests...?

Kathleen • Due with #2 June ‘19! Big brother Leo excited to meet his sibling. Previous struggles with loss and infertility due to PCOS. Excited this pregnancy is healthy so far!
Got these guys bulk on Amazon because after 17 months, this crap is getting expensive. But after no AF and no BFP, I'm wondering if I sacrificed quality for quantity.
Has anyone used these tests? I looked them up online and it looks like they are knock off wondfos... That shouldn't make them inaccurate, right?