text: what are the causes of brown disharge for women? i had a short period and am on the pill but after period i have had brown discharge for 3 weeks it was the rest of your period, the blood had gotten old and so tuerned brown.  my guess is that you are new to this brand of pill and maybe it's just not the best one for you.  i was like that on the depo shot, i never stopped spotting for the 3 months i was on it.  give your doc a ring and ask about getting switched to a new pill or method, best wishes