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Plus, sometimes when I'm in the shower and I'm on my period I may not have a blood clot or anything like that, but if I reach my finger into my vagina I'll actually pull out a long string of stretchy bloody mucousy stuff. Yuck, but that's how period blood is sometimes. that makes plenty of sense.
Prostaglandins dominate in menstrual fluid and stimulate the spontaneous activity of the human myometrial cells. A normal bleeding corresponds to a loss of up to 50 ml of whole blood. The mixture of vaginal fluid and menstrual blood produces a pH close to that of normal blood. The average cycle length is 28 days.