here is some information about normal menstual cycle that i hope will be helpful. as you can see in the content if you are having changes in your cycle you should contact your doctor and discuss what's going on. the webmd answers staff
i used to have bad cramps before and during my periods. this time there was no cramp and only 3 days heavy bleeding. why? . i am trying to conveive and i was expecting my period on 15th october. i started having brown spotting (very light) and then 2 days heavy flow and now nothing at all. and i didn't have any kind of pain through out the cycle. was i pregnant? what can be the reason of sudden shift in normal period?