If you have a low menstrual flow and have brown discharge, there is a chance that you are pregnant, but it is not absolute. When there is a drop in progesterone and HCG in the presence of pregnancy, it can cause a preterm miscarriage, so a brown discharge can occur, and a urine HCG or blood HCG test is needed to determine if you are pregnant. If there is no pregnancy, endocrine hormone problems, such as changes in the environment and stress during the month, including dietary habits, can also cause poor flow of menstrual blood and brown discharge. Even luteinizing insufficiency due to hypothyroidism and progesterone deficiency can cause brown discharge due to low menstrual flow. You can take oral medication to regulate your cycle according to your situation, and once in a while it will not affect your health.