There are many reasons that lead to 12 weeks of pregnancy to do NT to find that the fetus has already been arrested, such as placental dysplasia, congenital uterine anomalies and insufficient hormone levels, and so on. 1. Placental dysplasia: when the placenta develops abnormally, there may be insufficient blood supply and oxygen supply to the embryo, which may lead to the situation that the NT at 12 weeks of pregnancy reveals that the fetus has already stopped. 2. Congenital uterine anomalies: the uterus is reduced in size due to uterine anomalies, which causes the growth and development of the fetus to be restricted, thus leading to the situation of 12 weeks’ NT and finding that the fetus has already been aborted. 3. Insufficient progesterone levels: for example, insufficient progesterone levels, which cannot provide a normal uterine environment for the growth and development of the fetus, thus leading to the situation of 12 weeks pregnant and found to have been aborted by the NT. There are many other reasons that can lead to 12 weeks pregnant with NT and find that the fetus has been arrested, it is recommended that such patients go to a regular hospital, consult a professional doctor, and cooperate with the doctor to complete the relevant examination, in order to clarify the cause, to avoid blind treatment.