U may be pregnant or, if ur just starting to get ur period for the first time, it is completely normal because ur body isn't used to it yet. Periods are very unpredictable when u first get them. If u have been havin ur period for a while and are not sexually active, see a gyn. If u r, then take a pregnancy test. Good luck!! <3
Did you exercise too much? Sometimes if you exercise too much your period won't come, or if your very nervous or anxious, It also depends on how old you are. Anyways just to be on the safe side go to the doctor.
It depends on how many periods you have already had. About a year ago, i had my first period. The next month, i skipped and the next month and the next, untell about 7 months had gone by and i finally started again, then i skipped the next month and havnt started again sence february, so i whent to the doctors and she said it was VERY, VERY, normal! Its just because your our pituatary gland (which releases harmones) is confused and thinks that its not supposed to happen yet. So dont be scared or worryed that you cant have kids or anything:) cause its all completly normal! Your body is just trying to figure out what it wants right now! :)