as I said in my above post, thats how you work out how long your cycle is and when your approx fertile days are, it doesnt matter how long your period lasts
hi thanks for get back to me i start on the 27 oct im some times on for 4 to 5 days a month thanks
you measure the length of your cycle by counting from the first day you start your period, so the 27 oct is day one, then it finishes on the day before you start your next period, so if your next period started on the 25 nov, you would have a 29 day cycle, you would generally ovulate anywhere from day 12-18 of that cycle, you work that out by also counting the days from when you started your period, also keep an eye out for fertile cervical mucous, overay cramps etc, that would give you an indication that ovulation is near :)