First period? (Health and medicine, girls, blood)

Hey, I’m a 13 year old girl.

I have had white flow for 1-2 years (already have breasts and everything that belongs to puberty) and on April 19th I suddenly had brown mucus in my underpants .. I thought it was my first period, then it was gone again for 2 days and has been back for 9 days now. (You can see on the picture)

Isn’t it actually the case that the first period is only 2 days or so?

And the discharge is brown (very slimy) (I know many say this is normal at the beginning, but it doesn’t look like blood or dried blood)

Is it the first period or something else?

Thanks already for the answers

Lg

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