Know What to Do About Your Period

Steps

Call your mum. She might have some pads for you to help. If you are at school, you could quietly ask a friend or the school nurse for a pad/tampon.
Don't panic! Panic can make you work up to make your period longer.
Distract yourself by thinking of something else or doing something.
Buy pads/tampons or look into menstrual cups. Then keep them in your purse at ALL TIMES.
Expect the unexpected. It's okay if your period starts at work/school. Run to the bathroom and put on fresh knickers and a clean tampon/pad.
Keep track. Have a calendar or log from when it started and ended. Then you know long your next one will be and long until.
Make sure that you don't run out of pads or tampons for when your next period comes.

Never feel ashamed! There is a social taboo around menstruation but it's a completely natural thing. Every girl has it.
As an emergency measure, even neat and clean tissues could help. You could fold a couple or more and use(depending on the flow and on when you might get your hands on a tampon/pad). However when using tissues, frequent checking, like once an hour, is essential. It must be used as an emergency measure alone. Regular use might result in rashes.
Getting an app like Pink Pad (or others) is a really helpful way to start monitoring your period, and it even gives you a countdown until your next cycle is about to begin. Your period is like a monthly report card on how your body is doing. If there is a problem with your body, your period may reflect this. Make sure to log in symptoms such tender breasts, cramping or headaches.
Don't worry if your period is irregular for a a few years after it first starts. Some girls have their first period and don't experience another one for months.
If you don't have pads, ask your best friend for one.
For your first period use a pad. But in desperate measures it's okay to use a tampon as long as your parents know.
If it starts in a shopping centre or somewhere public, just ask a someone if they have any tampons/pads.

Try not to eat as much salty or fatty food or foods with a lot of added sugar such as soda, milk chocolate and candy. Doing this may help with bloating and cramping.
Prepare for possible symptoms such as cramps, nausea and pain.
Don't be afraid to talk about it. If you would like, you could even do some research online. There are many YouTube channels dedicated to talking about and helping with periods.