How to be prepared for my period?

Okay, so I track my period with this app on my iPhone. I'm suppose to get my 3rd period, but you know, they can be irregular. I'm suppose to go to school tomorrow & my period is due (what great timing.lol.)
Any ideas on how to be prepared just in case I get it? :/

Don't wear white pants/underwear you wouldn't like ruined. Have pads or tampons in your bag. Don't go to the bathroom if you can, so that the teachers will let you go if it hits during class.

Keep tampons and pads in your purse or backpack and if you get it just use them. If you're really worried you could use a panty liner too, but I think you'll probably kind of know when you get it.

I just recently got my period and I think the best way to get ready for it is to realize it doesn't hurt as much as you may think it does. It is really not that painful. It may hurt a little here and there but not to bad. Make sure that you also have a pad with when you go somewhere. I suggest not using a tampon the first time as it can be stressful. And remember it is ok to tell someone if it makes you feel better (just don't tell a guy, he will be confused and a little grossed out)

Wear dark jeans. Not the mega skinny jeans. Make sure they can be taken off easily in the washroom. Bring pads or tampons or whatever you use in your bag. O and durring my period i ussually bring a lot of snacks cuz i get cravings(random).

Bring your Midol, if you need it!

Its always handy to have a little girly bag in your school bag for emergencies. Keep a few pads or tampons and maybe some wipes in there so you can change during the day.

If you still haven't got your period in the morning when you wake up, maybe just wear a pad to school just incase it comes later during the day. Better to be safe than sorry!