What is inside a standard pregnancy test packet?

I opened my standard pregnancy test and it has a round, brown pill-looking thing inside and the negative line is built into the test. It is a Walgreen

I opened my standard pregnancy test and it has a round, brown pill-looking thing inside and the negative line is built into the test. It is a Walgreen's brand, and I have no idea what should be in the test?

or:I opened my standard pregnancy test and it has a round, brown pill-looking thing inside and the negative line is built into the test. It is a Walgreen's brand, and I have no idea what should be in the test?

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