Hello, You are not sexually active and this month you have missed your periods. You have irregular cycles. Presently you are having only brown blood and more of yellow brown discharge coming out. It may be indicative of yeast infection. Take care of your hygiene. Take bath regularly and wear soft cotton clothes. You can take a Single dose of oral medication fluconazole (Diflucan). Your symptoms should get reduced. Sometimes, you can also miss periods due to stress, exhaustion, weight gain or losing weight, anemia, poor general heath condition, etc. You are suggested to stay away from stress and anxiety, take home made nutritious food rich in iron and other minerals. Take high protein diet and also fruits and vegetables. Stay away from addictions if any. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician