The day you begin 'bleeding' is the first day of the menstrual. Then the days in between the next first day of bleeding is the length of the cycle, not the length of days that bleeding occurs. For instance, if you started bleeding on 1/5/08 and your next period starts on 2/1/08, you have a 28 day cycle. If you start on 1/5/08 and your necxt period starts on 2/3/08, you have a 30 day cycle. These are the most common cycles.
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you could use a calender to count off the days.
You count from the first day of your bleed until you bleed again, this is generally between 21-28 days :)
When you start your period if you have brown, old blood first you count those days as the first day of your 28 day menstrual cycle. You do not have to start counting day one when the blood is red.
The typical menstrual cycle is around 28 days in length.But everyone is different and menstrual cycles can vary by a few days from cycle to cycle.
yes it can come, other-words a perfect healthy women gets her cycle perfectly on 28 days to max of 32 days i.e plus or minus 2 days