The menstrual cycle is the time from the first day of menstruation in a woman to the day before the next bleeding. Not all women last the same, it is between 21 and 40 days with 28 being the average duration. Calculating the average time your cycle lasts is very easy, you just need a calendar.

**Calculate the length of your menstrual cycle**

- Write down the first day that your period comes, which corresponds to your first day of the cycle.
- Write down the next day that your menstruation comes again, that is, your next cycle start. The days that have passed between one and the other correspond to the duration of your menstrual cycle.
- Repeat the same operation for several months and then calculate the average. In this way you will obtain a more exact duration than if you based it only on a month.

**Ovulation calendar**

In a regular 28-day cycle, ovulation occurs on the 14th day, and may be between 10 and 16. To find out when it occurs in our body, we must subtract 14 (number of days that the luteal phase lasts). to the whole of our cycle. That is, if, for example, our menstrual cycle lasts 26 days, we would subtract those 14, leaving 12, the day on which ovulation will occur. Knowing this increases the chances of success if we want to get pregnant.