The first one to seven days of pregnancy may cause back pain, but there will be individual differences. During early pregnancy, some pregnant women may experience slight pain in the lower abdomen when the fertilized egg is deposited, resulting in back pain, accompanied by a small amount of vaginal bleeding, and normal blood HCG (human chorionic gonadotropin) levels, which is a normal physiological phenomenon, so the first 1 to 7 days of pregnancy may cause lower back pain, but not all pregnant women will experience lower back pain symptoms. Early pregnancy can be confirmed by blood HCG test at about 10 days after intercourse under doctor’s guidance, and ultrasonography at about 6 weeks after menopause to confirm normal intrauterine pregnancy, and should pay attention to proper rest, not to carry out gravity labor and strenuous exercise, continue to take folic acid on time, increase diet and nutrition appropriately, and comply with the doctor’s instructions for obstetric examination on time.