That all depends…have you had sex? Are you on birth control? Are you really stressed out right now? There are many factors that can contribute to your period being late. If you think you could be pregnant, take a home pregnacy test and then go from there. because if you are pregnant, you need to start taking prenatal vitamins and call your doctor. Good Luck!!!
you may just be stressed but if you have had sex in the past month you may be. wait another five days and if you period still doesnt come go to a drug store and buy a tests.
good luck