1. Common symptoms of three months of pregnancy Three months of pregnancy is a critical period for fetal development. At this time, the mother will also have some obvious symptoms. Common symptoms include nausea and vomiting, breast tenderness, loss of appetite, lethargy, etc. These symptoms are caused by changes in hormone levels and are experienced by most pregnant women. 2. Nausea and vomiting Nausea and vomiting are one of the most common symptoms of early pregnancy, especially around three months of pregnancy. This is due to changes in hormone levels that lead to increased gastrointestinal reactivity