Placental implantation can usually be detected after 12 to 13 weeks of pregnancy. Placental implantation refers to the abnormal attachment of the placenta to the uterus, which usually invades the myometrium, and in serious cases, it may also reach the plasma membrane of the uterus, or even invade the bladder, etc. In general, the placenta will form around 10 weeks. Generally, the placenta will be formed around 10 weeks, and if there is implantation of the placenta, it can be detected by ultrasound at 12 to 13 weeks. Placental implantation is a more serious complication that can lead to uterine rupture and intra-abdominal bleeding during pregnancy, which can increase bleeding in pregnant women during labor. Even if placenta implantation is not unchecked in the early stages, it is possible to develop it in the later stages. Therefore, pregnant women are advised to undergo regular maternity checkups without any carelessness in order to determine the condition of their body and actively cooperate with the doctor if there is any abnormality.