1. What are the symptoms of three months of pregnancy? 1. Breast swelling and pain 2. Nausea and vomiting 3. Fatigue and fatigue 4. Dizziness and dizziness 5. Frequent urination and urgency 6. Abdominal bloating 2. What is the cause of breast swelling and pain? Around three months into pregnancy, the breasts begin to gradually enlarge and become sensitive due to changes in estrogen and progesterone levels. At this time, breast hyperplasia during pregnancy will cause breast swelling and pain, and slight touch or pressure will cause discomfort. 3. How to relieve nausea and vomiting