When an egg doesn't get used, your body flushes it out. That 3-7 days you are on your period only one egg is being flushed out. After those days, a new egg "sits" and waits to be "used." If that egg isn't used, again you body flushes it out.
See the related link on what causes brown discharge after period.
Any number of causes. Food and the start of a period.
pregnancy
Period comes when you drink Malta . It causes miscarriage.
The causes of coming your periods twice a week are because, either you are a new starter to your period, in other words, your period is new, or, you ovulated 2 eggs which happens rarely.
If you are bleeding and it's not your period, it is important that you see a medical professional. There are many causes for bleeding and not being on a period. Certain causes may be extreme stress, a side-effect of birth control, or even pregnancy.
illness
Your period..............maybe or skid marks
Pregnancy.
they are moody and nasty
The hormones that rise and fall.
A month is a somewhat arbitrary period of time that loosely approximates the period of one lunar cycle.