Suddenly the breasts are not swollen on the 46th day of pregnancy may be related to reduced early pregnancy reaction and fetal arrest. Early pregnancy reactions, such as breast swelling and dizziness, accompanied by nausea and vomiting, may occur at the beginning of pregnancy. As the weeks of pregnancy increase, the early pregnancy reaction will be significantly reduced, and at this time, the breast swelling may disappear. If you have breast swelling at the beginning of pregnancy and it suddenly stops on the 46th day of pregnancy, it may also be due to the development of the embryo stopping. Therefore, if the breast swelling suddenly disappears on the 46th day of pregnancy, it is recommended to consult a doctor in time, and follow the doctor’s instructions to choose the appropriate examination method such as ultrasound, to clarify the cause with the help of the doctor, and to carry out targeted treatment or therapy.