Thanks for trusting us about your health care.
I can understand your concerns.
There are so many reasons of brown color discharge after period, it can be due to infection, your previous period blood, fibroid, hormonal imbalance and birth control pills.
So just wait and watch it, if it persist then you should consult a Gynaecologist for examination and treatment.
Hope it is of some use, feel free to ask more questions.
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