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.