pregorexia
n.— «The topic of celeb baby weight has even spurred a new phrase called “Pregorexia”—a condition where women get so obsessed with keeping their weight down during pregnancy that they go to extremes with diet and exercise, ultimately harming the health of their baby.» —“Celeb Moms Are Skinny B*tches” MomLogic Aug. 12, 2008. (source: Double-Tongued Dictionary)