Ok, i'm 14, and my period isnt on time?

ive been going through PMS since i was 13, itsskipped from around th 20th of the month to the 1st or 2nd of every month now. but its passed the 1st week of this month and it hasnt happened. i've nvr had sex so i kn its impossible for me to be pregnant. do u think its jst skipping around on me again?? im actually happy right now bec well im nt bleeding, but jst a lil worried about whts going on. im also takeing Minocycline for my acne, but i doubt tht has anything to do with it. plz help me?? i dnt like asking my mom about this stuff, jst weird asking my parents this.