Pleasepleasepleasehelpp!!!!!?

okay i had my first period on febuary 28th then again on may 18th and i should of gotten it yesterday but i didnt. im only having one sign..i just had a break out of like 7 pimples on my fore head and also im still having discharge(ive had this for like a year,no different) but anyway im going on vacation to turks and caicos in like 10 days on the 29th and im soooo scared im gonna have it. i didnt tell my mom and im not gonna ( dont tell me she knows and she can help cause im NOT telling herr!!!!!!) so do you think i will have it while im at turks and caicos or no because that will ruin my whole vaca. i know how to use tampons but i cant sneak them in the hotel. and is there any way too prevent my period.? im gonna try to loose weight cause i heard that can make it stop so any ways to loose weight in like 10 days? im currently 13 years old 5 foot and like 107 pounds. im a level 9 gymnast and i have lots of muscle so i dont even know why i got my period yet? whateverrr oh and does masturbation have anything to do with periods? and also is the time between your first and second period the same between your second and third?or shorter?or longer? and one more question can you just get your period with no signs at all?!? thanks a bunchh(:<3333