Women may experience breast tenderness seven days into pregnancy, generally due to changes in hormone levels caused by the pregnancy. This is a normal physiological phenomenon and there is no need for excessive worry. It is recommended that during the early stages of pregnancy, rest is important to prevent catching a cold and to ensure adequate sleep quality. Avoid mental stress and excessive fatigue. Nutrition should be balanced and well-coordinated, with an emphasis on eating fresh vegetables and fruits. Regular prenatal checkups should also be attended.