Just like five I have had a heavy period for years(since i was 11, i'm 29 now) but 2 months ago for oct and nov months my period has changed from 7 days to 4, its very light, not thick, and with lil to no clots in it.I was pregnant before and i did not know it cause i got my cycle every month like clock work with no symptoms,i had a miscarriage because of this. could i be pregnant or is this normal. i have never had cycles that did not have clots in them untill now should i be worried.and i am not on any type of birth control.