Back pain at 5 weeks of pregnancy is usually normal. In early pregnancy, the uterus enlarges, the pelvic cavity is filled with blood, and the enlarged uterus presses on the sacrum and coccyx, causing a sore feeling in the lower back. It is generally recommended to rest, avoid overexertion and keep your mind relaxed and not too tense. You should also pay attention to the smooth flow of urine and stool to avoid constipation. Most pregnant women will gradually relieve the symptoms of lumbar pain in the second month of pregnancy. If the lumbar pain persists and cannot be relieved, the pregnant woman needs to have an ultrasound examination as soon as possible to determine the situation of intrauterine conception and check progesterone and HCG if necessary to avoid pre-eclampsia, especially brown discharge, which may be caused by embryonic dysplasia and requires timely consultation at the hospital. Do regular maternity checkups during pregnancy and have family members assist in massage as appropriate to relieve back pain. Pay attention to balanced nutrition during pregnancy, diversify food, eat more fresh fruits and vegetables, avoid cold, spicy and stimulating food, avoid fried food, keep a good state of mind and pay attention to calcium supplementation.