Is there n e one that could help me with this...im kindve scared...?

It is probably just that the Plan B messed your cycle up. Do you have a regular period? If so, when does it usually happen? The Plan B would have caused you to shed your uterine lining so that it wouldn't be a hospitable place for an embryo. So if that wasn't when your normal period should have been, it's probably just your body trying to get back into the swing of things. I wouldn't really worry about being pregnant, but you could call your doctor if it worries you too much. Good luck.