 [ Symptoms ] what is the incubation period for possibly getting a uri from someone who has a coughhoarseness [ Disease ] most women conceive faster if they understand their menstrual cycle it is important to note that many women do not have regular cycles your cycle begins on the first day that you notice bright red blood    not just spotting    and it ends on the day before the next cycle begins the length of a woman is cycle can vary from 21 to 35 days or more if you notice that the length of your cycle varies by a few days from one month to the next then your cycle is considered irregular