Hi,
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The brown discharge could be indicative of old blood and products coming out. It could also be suggestive of possibility of infection. Visit your gynecologist/obstetrician for further evaluation to look for underlying cause. Get started on treatment as indicated. Avoid having intercourse until you are cleared form possibility of infection. If infection is detected, and if you are sexually active, get your partner also treated simultaneously to prevent re-infection. Drink plenty of water.
Take care.