It is normal when the breasts do not hurt on the 45th day of pregnancy and the embryo is well developed on ultrasound, but it is abnormal when the ultrasound suggests that the embryo has stopped developing. After pregnancy, due to the rise in hormone levels, most pregnant women will experience early pregnancy reaction, breast swelling and pain, but a few may not have a very obvious reaction, as long as the ultrasound suggests that the embryo is well developed, it is a normal phenomenon. When the embryo stops, at this time the hormone level of the pregnant woman’s body decreases, there will also be no pain in the chest, which is not normal. Early pregnancy pregnant women should pay attention to appropriate rest, according to their own response to the appropriate increase in diet and nutrition, continue to follow the doctor’s instructions to take folic acid on time, avoid strenuous exercise and exertion. When there is abdominal pain, vaginal bleeding, breasts suddenly not swelling and pain need to go to the hospital in time, ultrasound examination to understand the development of the embryo. During pregnancy, pay attention to rest more, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.