hun i am only 12 and it sucks having your period i got it when i was 7 and well now i am kinda used to it but when it first arrives your stomach will hurt and you might even throw up so i wouldn't hurry or wait for it to get here because you will just be dissapointeddd well it sounds like you have like only a couple of months left to go because you are 13 and you get your first period when you have the right level of horemones in your body............kinda awkward but talk to your mom as much as possible about it because she has had wayyyyyyyy more expierenceee..trust me even though it is kinda awkward at first she will be happy you asked and she will say you are finally growing more mature...........well anyway when your first period does come be sure to shower everyday because the flow can SMELL even if you have a fresh pad or tampon on/ in i hope i helped............ brit