What is the 'pregnancy line'?

What is the 'pregnancy line'?

Faint line on a pregnancy test- Are you pregnant? A fertility expert explains

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Linea Nigra: Pregnancy Line - American Pregnancy Association

Linea Nigra: What is that Pregnancy Line? Explained

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Linea Nigra — When Pregnant Belly Line Appears, Goes Away and More

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What Is the Dark Line on My Pregnant Belly?

What Is the Dark Line on My Pregnant Belly?