The menstrual cycle can be described as regular and irregular. Both of these methods can be described as normal conditions. Factors influencing your hormonal activity as well as your genes can be cited as factors that contribute to this. Also, your lifestyle and the food you eat can affect your menstrual cycle. However, if you want to know if this is an internal health problem, you should refer to a gynaecologist. It is advisable for you to see a doctor and get tested/treatments.