im 23 and i have had irregular periods since i was 13.they normally start off light and on the 2-3 day its really heavy to the point were i have to change my tampon/pad every hour or 30 mins.then it lightens on the 4-5 day.this month my period was on time but it started off heave for the first 2 days and towards the end of day 2 it got really light like its almost gone it is now day 3 and my period is so light i can wear a pantyliner.i had all the normal period symptoms the tender nipples,fatigue,and so on for about a week.what could be wrong with me