Looking for information about your first period? Concerned about the changes happening in your body? Puberty is a time that is filled with questions. Find out our answers to questions on the topic below!

Has your daughter just started her period, or will start soon? Check out our special “PARENTS” questions below!

Period: Menstruation calculator

The first day of your period is Day 1 of the menstrual cycle. The menstrual cycle is calculated from the first day of bleeding during a month to the day before the first day of bleeding the following month. Keeping a calendar will help you to know when to expect your next period. For example, if your period starts on the first of the month, lasts five days and you do not have another period until the 30th of the month, you will then have had a 29-day cycle.

You can also simply use our PERSONALIZED PERIOD TRACKER (custom menstrual cycle chart) to know when your next period will come!

Remember, however, that if it is your first period, it is likely that you will have a late period in some cycles. Indeed, girls often have irregular periods during the first three years of their menstruating life.

Visit our MENSTRUAL CYCLE section to learn more!