uhm,please help. im 14 yrs. old and i had very light menstration flow but it takes 2 or 3 weeks before it stops,and sometimes my menstrual periods are on and off. like the past two months i didnt have my menstrual cycle but now i have it but its very light, i dont even have to use napkins pantyliners are enough. how could this be?is there something wrong ? i dont experience cramps too. please help me.