According to the principles of medical ethics and privacy protection, doctors or medical institutions usually inform patients when they find that they are pregnant. This is to ensure that patients can get proper medical care and advice to protect the health of mothers and babies. Pregnancy will have an important impact on medical decision-making and treatment plan, so doctors need to know the pregnancy status of patients in order to provide them with the best medical services. Pregnancy will also have an impact on some occupations or working environments, so informing the relevant departments of health certificates is also to protect the rights and interests of pregnant women and fetuses.