How long after your menstrual cycle are you fertile?

How long is your menstrual cycle?

• I'm doing a case study in Anatomy and physiology class, and I'm supposed to ask females who aren't on birth control how long their cycle is. If you could answer, it would be much appreciated.

• Answer:

  Cycles between 23–35 days are very common. A woman may get her period only one to four times a year. Or she might have periods that occur two to three times in a month and involve spotting or extremely heavy flow. Alternatively, she may have heavy episodes of bleeding every two to three months. Irregular periods are simply what is irregular for you.