How should you count your period?

Dee • 31, SAHM🤷🏻, Bibliophile📖, Foodie🍕🍔🍟, Sitcomholic🤣, Potterhead☇
Hey ladies! I have a doubt lately. How do we actually count the duration of our periods? I know that the first day we see the bright red flow, it's our period. But as the days pass the bleeding becomes scant and then it's just spotting. I have a regular 6 day period. Out of which the last 2 days are either scant bleeding or spotting. So, am I supposed to count only the days where I have proper bleeding as my period? Or should I include the last spotting days too? Please advice! Thanks!!!