After 12 weeks of pregnancy, it is relatively safer than early pregnancy, but not without risk. The first three months of pregnancy is an important stage of fetal organ development, at this time the placenta is not yet fully formed, the fetus is relatively fragile and susceptible to external influences, if you do not pay attention to the phenomenon of preterm miscarriage is very easy to occur. After three months, that is, after 12 weeks, fetal development gradually entered a stable state, has been the first human form of the placenta has been formed, as long as not to do strenuous exercise the risk of miscarriage is significantly reduced. Pregnancy 12 weeks should do pelvic ultrasound, check NT value can initially exclude the relatively large malformation, after 12 weeks of pregnancy is an important period of fetal development, at this time need a lot of nutrients to protect the healthy development of the fetus, to eat more protein-rich foods, such as milk, eggs, fish soup, chicken soup, soybean products, etc., but also to eat more fresh fruits and vegetables, fruits and vegetables are rich in fiber, can prevent Constipation during pregnancy, the diet should ensure that meat and vegetables are well-mixed and nutritious.