You can't predict how long your first period will last because you need to keep track of how long your first few lasts in order to predict how long one will last.
For most people it lasts about a week.
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well, one: you wouldn't bleed if you weren't on your period? two: usually its clumpy for the first few times you're on it. and three: it gets lighter over time.
They theorize that during this period the first of three gill arches on a jawless fish evolved into the first jaws.
The first insects appeared in the Devonian, over three hundred fifty million years ago.
Girls usually have discharge for about 6 months to a year before starting her first period but it can vary from girl to girl. Some girls can have discharge for only about 3-4 months before getting their first periods as others may have discharge for about 2 years before they start.
the polio vaccine was first developed