[Dark-and-Twisty]

Well, it's normal for your period to be irregular when you're young, especially at fourteen. My period was irregular when I was that age, which is why I had to be put on birth control. Since you're already sexually active, which I was not, you need to talk to your parents as soon as possible. At any time you're having sex, there's a chance you could get pregnant, even with using a condom, because condoms break and nothing's 100% effective.

You need to take a pregnancy test, and if in the end it turns out you're not pregnant, get on birth control as soon as possible to regulate your periods and protect yourself.