Low back pain in early pregnancy is normal early pregnancy reaction if there is no abdominal pain and vaginal bleeding manifestation, therefore, low back pain in early pregnancy is normal. After pregnancy, due to the change of hormones in the body, it will cause local tissues and ligaments to relax causing lumbago and back pain. The increase of uterus after pregnancy will easily compress the pelvic cavity causing local blood return obstruction and pelvic congestion after pregnancy, which will cause lumbar discomfort, and at this time, no treatment is usually needed. If you have back pain in early pregnancy with vaginal bleeding, you should go to the hospital for ultrasound examination and blood test for HCG and progesterone.