Thank you for posting your question here, I will try to answer it to the best of my abilities.
A brown discharge usually happens because there is left over blood from your last period and since your not bleeding this time round as well but having the other signs of your period, it is possible that there is a blockage of some kind. As such go to a doctor and have an ultrasound
done to check if there is a blockage or not.
If there is, it will have to be unblocked and then you can have your periods normally.
I hope this answered your question.