In the second month of pregnancy, when the symptoms of breast swelling and pain disappear, this situation requires an ultrasound to check the specific development of the fetus. If the fetus is developing normally in the uterine cavity, there is no need to be too nervous. This situation is related to endocrine secretion, and it is possible that some pregnant women may stop having early pregnancy reactions at about two months of pregnancy. This is also a normal sign, during which nausea and vomiting may suddenly stop. It is also normal that this phenomenon may occur again after a few days. Some pregnant women start to experience breast pain, nausea and vomiting from the 40th day of pregnancy and it continues until the third trimester. As long as the ultrasound examination shows that the fetus is developing normally, there is no need to be too nervous about the other clinical manifestations.