Fertilized egg implantation usually occurs on the 7th~10th day after ovulation and the whole process takes about 3~4 days. Fertilized egg implantation is the process of invasion of late blastocysts into the uterine lining, which usually starts on the 5th~6th day after fertilization and ends on the 11th~12th day. After successful fertilization, chorionic gonadotropin begins to rise in the body, and pregnancy can be determined by measuring the level of chorionic gonadotropin. On the 7th to 10th day after successful fertilization, ultrasound can be used to determine whether there is a gestational sac in the uterine cavity. After the fertilization of the egg to bed should be appropriate rest, prohibit sexual intercourse, such as the occurrence of vaginal bleeding and other symptoms, should consult a doctor in time, so as not to delay treatment.