I am on birth control and recently i also took plan b. on birth control i don't typically get my period shouldni be worried? how can i know it worked?

About Plan B...: Plan B can alter the menstrual bleeding for the month in which Plan B was taken, and sometimes the next month too. One should be sure to check a home pregnancy test about 3 weeks after sex, because Plan B works most of the time, but not all the time. That said, couples having sex should always be ready for a rare, but cute, surprise baby... and getting married, settling down, raising a family,...