Thanks for the query.
, it will take sometime for regularization of the menstrual cycle.
And that time can differ from person to person.
The possible causes for your brown discharge are:
means scanty flow during periods due to loss of blood during abortion etc.
-Ovulatory bleeding, refer:http://srsree.blogspot.in/2012/08/mittelschmerz
If the spotting repeats in the middle of the cycle once consult gynecologist.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429