It is not normal to have a small amount of brown discharge at 5 weeks of pregnancy and your breasts don’t swell. The most common causes of brown discharge at 5 weeks of pregnancy and no swelling of the breasts are preeclampsia and biochemical pregnancy. Patients with abnormal embryonic development or insufficient progesterone support after pregnancy will experience vaginal bleeding, and after the embryo stops developing, with the HCG, progesterone decreases the feeling of chest distension will slowly disappear. It is recommended to pay attention to rest and reasonable diet after pregnancy; if there is vaginal bleeding, early pregnancy reaction (nausea, vomiting, chest distension, etc.) of the symptoms of the reduction of the situation, it is recommended to go to the hospital as soon as possible to confirm the diagnosis, and give the appropriate treatment.