My girlfriend took plan b twice in 2 weeks. the first time was fine and she got her period earlier but this time she's been really hormonal, and she's?

Drug is a hormone: Plan B can alter the menstrual period for the cycle in which Plan B was taken, and sometimes the next cycle 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. Be sure to get a "Plan A" (reliable, main method of birth control) so not to need Plan B again. Plan B is for emergencies and should rarely be needed.