Thanks for the query.
The brown discharge you had could be scanty menstrual flow.
Anyhow better to consult gynecologist once, get examined, go for ultrasound
and urine microscopy.
Repeated D&Cs can rarely lead to uterine adhesions sometimes that can lead to decreased menstrual flow.
By doing ultrasound along with this possibility other possibilities of delayed periods like poly cystic ovary disease etc. can be identified and treated.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429