In the first few days of pregnancy, there will be symptoms such as cessation of menstruation, nausea and vomiting as well as elevated basal body temperature. 1. Cessation of menstruation: After the sperm and egg have united to form a fertilized egg, and after it has settled in the uterus, the uterine lining will not shed regularly every month, which will lead to the cessation of menstruation. 2. Early pregnancy reaction: After pregnancy, the elevated HCG and other hormones may lead to a series of gastrointestinal symptoms, generally manifested as nausea, vomiting, and inability to eat. 3. Elevated basal body temperature: In the first few days of pregnancy, due to the rise of estrogen and progesterone in the body, the body temperature of pregnant women can be relatively high. There may be other reactions or symptoms in the first few days of pregnancy, and not necessarily all of the above symptoms will appear, the patient if you want to know if you are pregnant, it is best to consult a doctor in a timely manner, under the guidance of the doctor to check the HCG level to determine.