I am 31. Have had regular periods over the years. Cycle was 30days and lasting for 6-7days till now. Since last 6months it has reduced to 28days lasting for 5days. This month the cycle has reduced to 21days. I m worried as the periods stopped after 3rd day. I don't know whether this is normal or it needs medical attention. Kindly guide. Just for more info- I have a sedentary lifestyle, non vegetarian, I don't smoke, drink very rarely. Since last few months one thing that has changed is that there is a bit of stress in life because of which I have little irregular sleep pattern occasionally. Rest everything is fine.