Intense pain could be a sign of early miscarriage or ectopic pregnancy.

强烈的疼痛可能是早期流产或宫外孕的征兆。

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If a woman gets infected with CMV during early pregnancy, it can cause miscarriage.

如果一个女人得到感染巨细胞病毒在妊娠早期，它能够引起流产。

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Objective:Explore the environmental risk factors of early spontaneous abortion, so as to reduce the percent of miscarriage and Occurrence of adverse pregnancy outcome.

目的探讨与早期自然流产相关的环境危险因素，为降低自然流产率、减少不良妊娠结局的发生提供参考。

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But she kept the news secret because she feared a miscarriage in the early weeks of pregnancy, Jonsson wrote in her News of the World column.

BBC: Ulrika Jonsson and Lance Gerrard-Wright

There are also some findings showing that stress can increase the likelihood of miscarriage but because so many early miscarriages go undetected, they are more difficult to study and data is not easily available.

BBC: Earthquakes 'trigger early births'