At the end of December, a boy rubbed his penis on my vagina and the next day I had my period. A week before my next period I had all the syptoms of implantation bleeding, this has worried me because I ALWAYS bleed heavy but this time it was completely different. I have never had sex so it's very unlikely that I'm pregnant I'm just worried.

You don't need to have intercourse to get pregnant. Vagina + penis "rubbing" against vagina = pregnancy.

If you had your period, no, you aren't pregnant.

Before you indulge in any other risky behavior you should learn how your body works; decide if this "boy" (who apparently is equally irresponsible) is a good candidate for the father of your possible child; decided how you are going to support yourself and a child.