Amazon First Response Tests?

I hear mixed reviews on first response tests. I have had success with them with my first pregnancy. I am now buying them on Amazon since they are way cheaper and wondering about their legitimacy.. so far not pregnant so I can’t say for myself.

Tip: I had success with the cheap ClinicalGuard on amazon (pack of 20 for $7.99!) *Of course sensitivity is lower than the early result tests.

Also- if anyone can invert this for me just out of curiosity 🤷🏼‍♀️

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