Hi, Brown discharge suggest old collected blood. It is likely that you may have had some sub-chorionic bleed which later sealed off and this discharge which is currently seen is a result of this. You should take bed rest, avoid all stressful activity including intercourse, get regular evaluation, get a trans-vaginal sonogram once every two weeks until the pregnancy becomes stable and take progesterone supplements if necessitated. Do not strain while passing stool ans see that you are not constipated; consume fresh vegetables and fresh fruits. hope this helps.