My period. TMI

So I haven't had my period and I was supposed to get it today but it never came. I usually get it early in the morning but it never came. I don't know what to do because it's late looking at my past periods. I'm going to the beach tomorrow and I don't want it to sneak up on me or if I'm over reacting. What do I do. I haven't had sex I'm a virgin. I've only sucked dick. I know there some ways to get pregnant other than sex. Also from today TMI I've had to go to the bathroom a lot. I'm so young and I'm scared