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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This can sometimes lead to a silent miscarriage early in the pregnancy.

有时会导致在怀孕期间无声无息的早期流产。

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Kidman had a miscarriage early in her relationship with Tom Cruise, leading them to adopt 2 children. They divorced in 2001 after 10 years of marriage.

41岁的妮可和前夫汤姆·克鲁斯10年婚姻期间也曾怀孕，但因流产而认养了两名子女，两人2001年正式离婚。

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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'