When the fetus is fully developed at 12 weeks of pregnancy, the brown discharge appears at this time, you need to pay attention to see if there is any stomach pain. If there is no pain in the stomach, take care to rest in bed, and then observe if the bleeding continues to increase. If there is no increase, this phenomenon should improve after bed rest. If there is an increase in bleeding, consider the possibility of miscarriage, you should do an ultrasound examination in time to determine the condition and take symptomatic treatment to preserve the fetus, you also need to pay attention to maintain a relaxed mood, do not have too much stress.