What decide if a interval is going to be weighty or pale?

i'm 17 and i dont get that module. i know about the child stuff and what the period is doing but i dont get hold of what makes it thickset sometimes and other times lightWhat decide if a interval is going to be weighty or pale?
Hormones. They are different within everybody. If you are having irregular or stocky periods consider getting on the pill. It will regulate your extent, they will be lighter, less or no cramping and you will know when you will be have your period. Talk to your Dr or if you want confidentiality, move about to your local Teen Clinic or Health Dept (most of the time it is free there too and they do your once a year physicals and paps and STD checks). AND they are confidential. Hormones.....UGH!
Hormones.
hormones, and sometimes there is more blood that wants to come out and sometimes there is smaller number. depends on how long u have be menstruating. sometimes when u just start ur cycle is irregular.
hormones, and stress could also be a factor. i gain weight finishing summer, and i remember my period enduring for 2 weeks, and it was really large. when i got sick and couldn't guzzle, i lost weight, thus resulting within a light flow, but who know, every female is different.