Mucousy-clot things, what is this?

Because of your conditions, I would mention this to your doctor in case it is a symptom of something worse. But near the end of my periods, which are regular, I sometimes get brown-coloured clots. The actual period fluid contains more than just blood, and is thicker than normal blood. Its easier for the fluid to clot, especially near the end when it isn't flowing out as well anymore. Little chunks are ok, but they should not get very big.