Final answer:
The nurse would teach a primigravida client about the significant impending labor sign of bloody show, distinct from other common pregnancy signs.
Explanation:
Bloody show is a significant sign indicating impending labor that a nurse would teach to a primigravida client. It occurs when the mucus plug in the cervical canal is expelled, along with a small amount of blood, prior to the onset of true labor. Weight gain, quickening, and fatigue are common signs during pregnancy but may not specifically indicate impending labor.
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