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Summary. 1  A period occurs when a femaleâs body sheds the lining of the uterus every 28 days. Implantation bleeding occurs in a pregnant woman when the egg travels into the uterus and into the lining. 2  Implantation bleeding occurs at the normal time a period occurs, yet the blood is dark red with a brown tint.
Menstrual bloodis mainly composed of blood, old parts of uterine tissue, cells from the mucus lining of the vagina and bacteria making up the vaginal flora. Menstrual blood is different from normal blood due to its composition and its physical properties. Put another way, menstrual blood is blood mixed with secretions from the vagina and cervix, old cellular tissue, red blood cells and mucin.