Hi, Thanks for posting in HCM. I understand your concern. Brown discharge and light cramps in the stomach could happen after conceiving and you need not be afraid of it. Also, having intercourse after implantation would not lead to ectopic pregnancy. However, sometimes it might cause miscarriage, which you need to be careful about. Kindly take adequate physical rest during this period and avoid strenuous work. Eat healthy food and improve your intake of fluids. Kindly get an ultrasound scan of the abdomen done and consult Gynecologist with the report for clinical evaluation and appropriate management. Hope the information provided would be helpful. All the best.