It is possible to bleed a few days after the embryo does not implant. Normally it takes about 5 days for a fertilized egg to implant, and even if the embryo doesn’t implant, the fertilized egg will survive in the uterine cavity and wander around for about 3 to 5 days. When the endometrium completely loses the influence of estrogen and progesterone, the fertilized egg will move down as the endometrium is stripped and expelled, at which point vaginal bleeding may occur. Failure of embryo implantation may be affected by abnormal secretion of estrogen and progesterone in the body, incompatible development of the endometrium and embryo, etc., or if a woman suffers from endometrial polyps, uterine adhesions, and other abnormalities, which may lead to failure of embryo implantation. Clinically, there are many other reasons why the embryo does not implant, so if the patient has multiple spontaneous abortions or biochemical pregnancy phenomenon, it is recommended to go to the hospital in time for examination to determine the cause of the cause of the disease and then give the corresponding treatment.