If bleeding occurs after the 7th day of implantation, the following possibilities are considered: 1. Embryo stops developing or miscarriage occurs due to failure of implantation. In this case, the patient needs to check the blood HCG and progesterone, if the results are relatively good, then it is considered to be a pre-eclampsia, according to the situation of timely treatment of fertility preservation; if the results are not good, then it is considered that the embryo failed to bed, the likelihood of miscarriage is relatively large. 2, the possibility of ectopic pregnancy. In this case, we need to dynamically observe the blood hHCG and progesterone, ultrasound, if diagnosed as ectopic pregnancy, we need to timely medication conservative treatment or surgical treatment, to avoid the risk of rupture.3, consider the possibility of cervical lesions or vaginal changes caused by bleeding. After pregnancy, the vaginal resistance will be gradually reduced, and the vagina will be congested, if the patient has vaginal inflammatory diseases or cervical polyps and other diseases, bleeding can occur.