Talk to Gynecologist on Periods Related

Hello doctors i am facing a light periods flow from last 3 or 4 cycles i used to have normal to heavy flow in 2 and 3rd day and cycle lasted 6 days from last cycle it lasted 2 days i never have any periods related problem i alhamdolliah conceived in first month of my marriage and have 16 months old but now I'm facing this I'm not on any birth control pill or contraceptive periods exact 29 day ko hi ho rhy late nai ya skip nai but only flow is light I'm worried if it causes any fertility issue in future or wht could be the problem??? I am alhamdolliah not facing any medical related problem plz help me