Depending on where you are in your cycle, you could get pregnant. (You could also get pregnant using "pulling out" -- it is not a method of birth control but is more just justification the guy uses so he doesn't have to wear a condom.) It's just barely not too late to take Plan B. If you are about two weeks from when you expect your next period to come, it wouldn't be a bad idea, but you'll have to hurry. Taking it in 48 hours is better than taking it in 72 hours.