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How to prevent large blood clots during menstruation 
Look for blood clots. 
One of the main signs of heavy bleeding (also called menorrhagia) is having blood clots in your flow. For this diagnosis, blood clots the size of a quarter or larger are considered to be connected to heavy bleeding.
Check your pad, tampon, and the toilet for blood clots. Blood clots will look like regular menstrual blood, except they will be more solid, almost jelly-like.