There is no blood during menstruation, only brown things, and there is a lot of bleeding after menstruation.

Theoretically, "the end of menstruation" should be a state without menstrual blood and other secretions. But in practice, there are often various manifestations. For example, the "brown thing" you said: it may be formed by the shedding of epithelial tissue that heals and scabs after endometrial bleeding. Because it may be contaminated by menstrual blood, there may be "brown", "reddish brown" or even "black" residues; It may also be a "blood clot" formed by the condensation of finely divided menstrual blood residues. Due to sedentary and long-term lying position, how long does it take to stay in the endometrium? Under normal circumstances, when menstrual blood stays somewhere for more than 5~ 10 minutes, it will form congestion and even blood clots. After the normal endometrium heals, it is excreted with the secreted tissue fluid; Of course, it may also be the aging necrotic tissue and cell fragments that fall off after the normal cells undergo self-metabolism, division and renewal, and so on ~