my girlfriend took plan b three times in one month, when will be the next time she gets her period?
There’s no way to know exactly when your girlfriend will get her period, because that depends on her body and her menstrual cycle. Taking Plan B (also called emergency contraception, or the morning-after pill) can temporarily change someone’s menstrual cycle, so your girlfriend’s period will probably be different for at least a month.
There’s nothing harmful or dangerous about using the morning-after pill as often as needed. But it’s not the best method to use on a regular basis, because it doesn’t work as well as other types of birth control (like condoms or the pill).
If you can, try to use a regular form of birth control whenever you have penis-in-vagina sex to prevent pregnancy. And don’t forget to protect yourself and your partner from STDs, too — condoms are the only type of birth control that also prevents STDs. If you use a condom plus another method of birth control — like the pill, patch, ring, shot, implant, or IUD — sex will be a lot safer and you won’t need to rely on Plan B.
Learn more about different birth control methods here.