患者，女，23岁。初产妇，妊娠7周，恶心、呕吐，甚则食入即吐，口淡，食欲减退，便溏。彩超:子宫大小5.1cmx5.5cm,肌层回声均匀;宫腔内可见2.1cmxl.3cm胎疲回声，可见卵黄疲。需与该病鉴别的疾病是

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