Just calm down yourself. its normal
know yourself/thyself first by knowing your likes and dislikes
keep away from lots of dirts
make yourself always clean and comfortable
make sure that you double check / be aware of your monthly period
dispose properly your waste

menstration is sometimes called "visitor"
maybe you must keep away from making many actions or some likot likot :)

others says that we must keep away from eating chocolates and drinking softdrinks hehe.

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your welcome :)
just ask as long as i can help u.. because im also a girl :D haha