Cervical opening refers to the opening of the cervix, and generally the chances of the gestational sac starting to flow towards the cervical opening to be retained are unlikely, and the possibility of miscarriage needs to be considered to exist. The gestational sac is the original placental tissue and the initial form of pregnancy. Under normal circumstances, the location of the gestational sac should be in the uterine uterine fundus, anterior wall, posterior wall, upper, middle, etc., when found that the gestational sac began to flow to the cervical os, the position of the cervix in the lower part of the uterine cervix, in general, the chances of preservation are not very good, and need to consider the existence of the possibility of miscarriage. At this point, the pregnant woman may experience paroxysmal lower abdominal pain, vaginal bleeding and other symptoms, and then the gestational sac and other gestational material will continue to be expelled, and after the complete expulsion of the vaginal bleeding, uterine contractions will stop. Miscarriage may occur due to embryonic or chromosomal abnormalities, severe infections, endocrine abnormalities, strong stressful stimuli and other reasons. To summarize, for pregnant women with pregnancy sacs that begin to flow toward the cervix, they need to go to the hospital in time and follow the doctor’s instructions for treatment.