Your period usually happens around ever 21 days so on a calender you can count and see where-about your period will start! Unless you are still young it will either e very later early or you might miss it for a while.
How Do You Calculate Your Next Period?
Your menstrual cycle is usually between 28 to 32 days. The first day of your period is day one. Just count 28 to 32 days later and your period should start again.