The fertility window starts 5 days BEFORE ovulation, includes the day of ovulation and the next day following ovulation – a total of 7 days.
So, for a regular cycle of 28 days, the fertile days are from the 9th to the 16th day of the cycle.
For a regular cycle of 26 days, the fertile days are from the 7th to the 14th day.
For a regular cycle of 24 days, the fertile days are from the 5th to the 12th day.
For a regular cycle of 30 days, the fertile days are from the 11th to the 18th day.
For a regular cycle of 32 days, the fertile days are from the 13th to the 20th day.
For a regular cycle of 34 days, the fertile days are from the 15th to the 22nd day.
For more information on fertile days and the fertility window, read this.
