The symptoms of back pain in the 7th week of pregnancy is not normal, consider because of physical exertion or the manifestation of pre-miscarriage, the uterus did not increase significantly in the 7th week of pregnancy, will not appear due to the body overburdened caused by physiological back pain, if there is a heavy physical labor may cause back pain, as long as there is no obvious abdominal pain accompanied by vaginal bleeding is not a big problem. If the back pain is caused by low progesterone, you need to pay attention to whether or not there is a pre-eclampsia, you need to go to the hospital as soon as possible for a blood test to find out whether or not the body’s progesterone and human chorionic gonadotropin are normal. If there is a low progesterone level, you need to take progesterone supplements or use dextroprogesterone to improve the situation and preserve the pregnancy.