Talk to Gynecologist on Periods Problem

Hi my periods are regular with 28 days of cycle with heavy bleeding first 2 days and normal to no next 3 days.but from last 3 months blood flow is same first 2 days but at the end of 2nd day it decreases with very lil flow 3rd day and in the end of 3rd day my periods end.i used to get 5 days of periods but now it has decreased to 3.y?is there anything to worry about??please help.