Successful implantation means that the fertilized egg enters and settles in the uterine lining 6~7 days after its formation, which can be judged by symptoms, blood or urine hCG, ultrasound, etc. 1. Symptoms: The body temperature will drop slightly when the fertilized egg is implanted, and some people may also experience bleeding, fatigue, tiredness, abdominal pain, soreness, and so on. However, these manifestations vary from person to person, and some people may not feel anything, and the symptoms can only be used as an auxiliary method of judgment. 2. Blood or urine hCG: 1 day after the successful implantation of the fertilized egg, the level of hCG (i.e., chorionic gonadotropin) in the body will rise, which can be determined by drawing blood or urine test. However, hCG test cannot exclude ectopic pregnancy and is often used as a screening tool to determine pregnancy. 3. Ultrasound: 1 week after the fertilized egg is deposited, the gestational sac and fetal buds can be seen directly in the uterine cavity through ultrasound, which accurately reflects that the fertilized egg has successfully deposited in the uterine lining. It should be noted that the daily pregnancy test is prone to inaccurate results. If pregnancy is suspected, it is recommended to go to the hospital for a formal examination to determine pregnancy.