Hello,
Brown discharge after period could be due to delayed shedding of endometrial lining which could have turned into a scab and look brown in colour. It could also occur due to STD’s, Pelvic inflammatory disease, pregnancy and trauma to the vagina or cervix or uterus.
You might have to go for a complete hormone profile and ultrasonography to know the cause of this .Get in touch with an Obstetrician and Gynecologist for further assistance.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing
It's your period don't need to worrt