When a girl is newly pregnant, she will have stopped menstruation, breast swelling and pain, elevated blood HCG level, nausea or accompanied by vomiting, etc., which need to be analyzed specifically. 1. Stopped menstruation: When a girl is newly pregnant, the uterine lining will no longer shed normally, which will stop menstruation. 2. Breast swelling and pain: During pregnancy, the corpus luteum secretes progesterone, which raises the level of progesterone in the body and stimulates the mammary glands, leading to breast swelling and pain. 3. Increased blood HCG level: After the fertilized egg is deposited, the human body secretes human chorionic gonadotropin, which tends to double when the blood HCG is measured. 4. Nausea or vomiting: This may be accompanied by symptoms of digestive disorders, nausea or vomiting. If a woman has unprotected sex, it is recommended that she seek medical attention to determine whether or not a pregnancy exists and whether or not it is a normal pregnancy.