If you have brown blood and it does not look like menstruation, you need to consider the timing of the bleeding. If you have brown blood when you should have your period, first of all, you should have a blood HCG test to rule out pregnancy, because there are signs of pre-eclampsia and a small amount of brown discharge in the early stage of pregnancy. If the endometrium is thicker, it may be due to incomplete atrophy of the corpus luteum, leading to incomplete withdrawal of progesterone, resulting in a small amount of brown discharge caused by the shedding of endometrium, which can continue to be observed. If there is brown blood in the middle of menstruation, consider ovulatory bleeding, which is caused by irregular shedding of endometrium due to low estrogen level. The bleeding will usually stop after a week.