Constipation may have a certain effect on birth control, which may aggravate the symptoms of miscarriage or preterm labor and lead to failure of birth control. When abdominal pain, vaginal bleeding and other symptoms of pre-miscarriage or preterm labor occur during pregnancy, follow the doctor’s instructions to pay attention to appropriate rest for the treatment of fetal preservation, and if necessary, absolute bed rest is also required. Because of the weakening of intestinal peristalsis and intestinal tone after pregnancy, coupled with the reduction of exercise during the period of fertility preservation, it is easy to become constipated, constipation will increase the abdominal pressure when defecating, which will aggravate the symptoms of miscarriage or preterm labor, leading to the failure of fertility preservation. After pregnancy, we should pay attention to adjust the diet structure, increase dietary nutrition, and eat more fiber-rich fresh fruits and vegetables and cereals, but also to develop a good habit of defecating on time every day. When constipation occurs, it can be improved by dietary changes, and if necessary, lactulose and other medications can be given to promote bowel movements as prescribed by the doctor. During pregnancy, pay attention to rest more, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.