Uterine bleeding in pregnancy may be related to the presence of miscarriage, ectopic pregnancy and other reasons, and it is recommended to pay attention to it in time. 1. Miscarriage: Uterine bleeding after pregnancy may be a sign of miscarriage, which occurs before the 28th week of pregnancy, and may be related to chromosomal abnormality and poor embryonic development. 2. Ectopic pregnancy: uterine bleeding in pregnancy may also be due to ectopic pregnancy, usually due to the fertilized egg not in the uterine lining of the endometrium, which leads to the development of the embryo tubal pregnancy rupture and other circumstances occur, bleeding. Uterine bleeding in pregnancy may also be related to other causes. If the symptoms of uterine bleeding in pregnancy are not relieved, or accompanied by other symptoms, you should go to the hospital in time to see a doctor to clarify the cause of the bleeding and then give targeted treatment.