your cycle length is from the 1st ture blood to the next so say you started today the 11th of Sept, and your next cycle started October 14th count Sept 11 as day 1 all the way through to October 14 that is 34days so that would be a 34 day cycle. another example. Say your cycle was Sept 11- Oct 11 tha'st 31 and that again is your cycle length. Hope this helped an good luck to you!!!! :-)
what was the first day of your last period?? That would be day 1 of your cycle. The day before your next period is supposed to start is the last day of your cycle. so if your next period starts on a sunday your last day of your cycle would be Saturday.