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According to Dr. Marjorie Greenfield, ob-gyn and author of The Working Woman's Pregnancy Book, approximately 70 percent of women experience nausea early in pregnancy and about 50 percent experience vomiting. "It's very, very common, but it's also incredibly varied," Greenfield says. "Lots of people are sick all day, some are sick mostly in the evening, and others are sick if they haven't gotten enough sleep." Morning sickness can start as early as six weeks into pregnancy and tends to peak around the eighth and ninth weeks, according to Greenfield.
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