I'm 21 and ive always had a fairly heavy but regular period. last week i got my period on time, it went away, and then yesterday it started again out of nowhere. it is extremely heavy with huge clots. i went so sleep with a pad and super plus tampon and woke up 5 hrs later to my entire shorts soaked :( this has never happened before. i havent made any significant changes in the last while or been under much stress?? i ate a lot this weekend because it was thanksgiving thats it....whats happening? how long should i wait before seeing my doctor?? also im not on any medications either including bc.