Took plan b 3 times in one month. is it normal to have a late or missed period. when should i be worried? how long until my hormones/period go normal

Plan B: Plan B will interfere with your normal menstrual cycle for that month, particularly when taken three times that month. If you do not have a period this month, you should do a home pregnancy test. On top of that, it is obvious that your current form of birth control is not working if you need to take Plan B three times this month. If you are going to be sexually active, you need a better plan.