How to track your menstrual cycle starts with counting the first day of your period as Day 1. Continue counting each day until the day before your next period begins. The total number of days counted from the first day to the last day is your cycle length.
Your menstrual cycle is the time between two periods. The average cycle is 28 days, but it is still normal for cycle length to range from 21 to 35 days. It is also common for cycle length to vary from month to month, with a difference of up to 7 to 9 days between cycles.
Ovulation usually occurs about 14 days before the start of your next period. If you have a regular 28‑day cycle, this means ovulation often happens around the middle of your cycle. The most fertile time typically spans from 5 days before ovulation to 2 days after. Tools like an ovulation calendar or taking an ovulation test can help you identify your fertile window more accurately.
If you're unsure how to track your menstrual cycle or notice changes in your usual pattern, it's best to see a gynecologist or other women's health provider. They can guide you on how to monitor your cycle and check for any underlying health issues that may need treatment.