I've been taking birth control for 1 year, and had unprotected sex with my boyfriend. Would it be a good idea to take plan B?

Will you be having regular sex with boyfriend, plan B is only for use once in a while.

It is best to use at least two forms of birth control,

But no birth control is 100 percent.

Of course birth control prevents you from having babies. But I've also heard that it ruins your system and the chance of you getting pregnant even after not taking them anymore are less likely.