Late light Preiod what does it mean? Please Help. Worried

Hi i am 21 years old.. I normally have a 26 day cycle with 21 days off 5 days on. but this month it was very abnormal I was due on, on the 6th but I didnt come on till yesterday (8th).

My preiod is very light. I normally have a very heavy flow for the first 2 days of my preiod then it slowly gets ligher. But this time I Dont even use up a tampon a day.

When I take a tampon out it barely has any blood on it just the smallest amout right on the tip of the tampon which is more of a brown colour then the normal red or pink I have.

Also I dont have any preiod pains or which its strange to me as I normally have horrid pains for the frist day. (sometimes I am in tears how much it hurts)

I am not on any contraception or taking any drugs. I am eatting, drinking exersing and sleeping the same as I normally do. I am not stresseed. What else could it be?

Is something wrong with me?

Should I do another pregs test? (I took one the day I was due on)

Is it normal?

Happend to anyone else?

If so what was it that made your preiod so abnormal?