Marginal placenta praevia
at this stage of pregnancy
, usually recedes into the upper segment as the pregnancy advances and may not cause future problems. Yet, since you already had bleeding episodes, you should be cautious about any prolonged bleeding. Brownish discharge indicates old bleeding, but it should have decreased by now, if it was from the bleed you had in hospital. I advice you to call your doctor and inform. You may not need to be hospitalized for this, but care should be taken. Wish you a healthy pregnancy.