What decides if a term is going to be heavy or standard lamp?

i'm 17 and i dont get that constituent. i know about the babe-in-arms stuff and what the period is doing but i dont gain what makes it solid sometimes and other times light
Answers:

As a woman I have have a consistant pain surrounded by my left side.Do you own any reasons?

Hormones. They are different surrounded by everybody. If you are having irregular or stout periods consider getting on the pill. It will regulate your length, 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, run to your local Teen Clinic or Health Dept (most of the time it is free there too and they do your twelve-monthly physicals and paps and STD checks). AND they are confidential. Hormones.....UGH!

Is there a cure for pcos?

Hormones.

Oops I forgot to cart some of my birth control uh?

hormones, and sometimes there is more blood that wants to come out and sometimes there is smaller quantity. depends on how long u have be menstruating. sometimes when u just start ur cycle is irregular.

Does the Sleep Bra work?

hormones, and stress could also be a factor. i gain weight closing summer, and i remember my period enduring for 2 weeks, and it was really lashing. when i got sick and couldn't guzzle, i lost weight, thus resulting in a fluffy flow, but who knows, every womanly is different.