I was late last month or my cycle and this month no cycle at all what can this be?

Several things: Pregnancy first thing that comes to mind. Be sure to check home pregnancy test, first morning urine. If negative, repeat in 2 weeks. If both neg, unlikely you are pregnant. Anovulatory cycles is another issue. Miss a period or periods become irregular due to "imbalance" in the VERY COMPLEX processes that need to be in sync for you to have period. If you have another cycle abnormal see doc

Amenorrhea: The most common reason for a missed period is pregnancy, so, first check a pregnancy test. Other causes of irregular or missed periods include anything that can upset your hormone rhythm, including any change in birth control pills, use of depo-provera, stress, major change in level of exercise and sudden loss of weight, and many many more. PCOS is one of many possible medical causes.