Doctor's Notes on 13 Early Pregnancy Symptoms and Signs
Symptoms of early pregnancy can begin within the first weeks of pregnancy and occur due to the hormonal changes taking place in the body. Not all women experience the same symptoms of early pregnancy, and symptoms vary in severity. Early signs like absence of menstrual periods and weight gain occur in all pregnancies. Other associated symptoms may vary, but common signs and symptoms are fatigue, tiredness, mood changes, and nausea, which is often referred to as “morning sickness.”
Other symptoms and signs of early pregnancy can include headache, breast soreness or tenderness, increased urination, low back pain, and darkening of the areolas. Some women experience mild vaginal bleeding around the time of implantation of the fertilized egg in the uterus. This bleeding or spotting usually occurs around the time of the expected menstrual period.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.