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Blood Clots during Period. It is normal to pass blood clots during menses, as along with the blood the thickened lining of the uterus is also being shed and expelled outside the body. In case the abnormal blood clots during period occur, visit your gynecologist as it may then be an indication of other serious medical illnesses.
These can look like black or dark jelly-like clots, that are shiny, or more granular brownish clots that can look like bits of liver or tissue. These have a lot of fibrin (a substance that aids in blood clotting) in them. In your case it sounds as if you are not losing blood at a consistent rate during the period. When it is slow, you are hardly seeing anything, and then there is a more rapid loss and these clots appear.