Vacation with period

So I am going somewhere tropical in about a week and a half and I’m going to get my period right in the middle of the trip. I really don’t want to get my period on the trip because I want to go swimming!! Is there any way that I can get my period today or push it back a week without medication or some kind of pills? I’m 14 and can’t buy anything by myself without an adult driving me but I don’t want to tell either one of my parents that I need pills for my period. If anyone has tips for delaying your period a week or getting it sooner, I would really appreciate it if you helped me out! <3