When am I fertile?
The menstrual cycle
begins on the first day of your period (the first day of bleeding). Over the course of a menstrual cycle, an egg matures and is eventually released (ovulation). This happens approximately halfway through your menstrual cycle. Depending on the length of your cycle, it can be between 10 and 16 days before your next period. Before you can use the fertility awareness method, you need to understand how long your menstrual cycle is.
How to calculate your fertile days
To calculate your fertile days, you should first track your menstrual cycle for about six months.
Take the length of your longest cycle and subtract 11 days to calculate your last fertile day.
Take the length of your shortest cycle and subtract 18 days to calculate the first day of your fertile period.
If your shortest cycle was 28 days and your longest cycle was 30 days your calculation would be as follows:
28 days - 18 days = 10 days
30 days - 11 days = 19 days
Now circle these dates in your diary. For example, in the example above, the fertile days are from day 10 to day 19. During this time, sex should be avoided. It is not advisable to go by timing only and you should also monitor other signs of fertility.