Plan B withiin 24 hours?
Answers: You're probably fine, calm down..
It's unlikely that you are pregnant. If you are on the pill and are taking it correctly and you also took plan B then you should be protected. But don't verbs if you period is late... if you time of year does not start on Thursday... it could be because you took plan B... sometimes it makes your periods a few days early or later. But if you don't get your extent in 3 weeks that will be the time you should take a P oral exam. chances are slim- especially if you're expecting your period surrounded by a few days. And if you're already on the pill, you're chances are even slimmer. The only point is that you're period will be a little messed up for a few months- plan, you may spot every other week until you're back to normal... see, near the pill you already expect your period but plan b forces you to get your time so it's fooling with your cycle .. hope I'm not confusing you :) best of luck.
You're probably ok, since you took Plan B within 24 hours and are on birth control.