In the early stages of pregnancy, common symptoms such as nausea, vomiting, fatigue, and dizziness, known as early pregnancy reactions, typically appear around six weeks after missed menstruation. Around eight weeks of missed menstruation, due to the increase in estrogen and progesterone, one might experience breast tenderness, but these are not the main criteria for diagnosing pregnancy. The first clinical symptom of pregnancy is missed menstruation. For women of childbearing age with regular menstrual cycles, a noticeable delay in menstruation of ten days should initially prompt a consideration of pregnancy. This can be confirmed through elevated levels of blood HCG, followed by an ultrasound that reveals a visible gestational sac in the uterus to confirm the diagnosis.