8-13 days after your 1st day of your last period
Normal days must be 14 and total of 28 days
I want to know if ovulation happens at the age of 10 to say 30
Starting of periods in a girl depends upon both environmental and genetic factors. Average age at which girls get their first periods is different in different regions of the world. In USA, it is 12.5 years and in Asian countries, it is 11 years. First periods in a girl life are always without ovulation. Ovulatory periods usually start 3 months to one year after getting first ever periods. On average, a women has 400 cycle in her life and anovulatory periods again start in premenopause age. Premanopause age is also different in different regions of the world. It can vary from 42 to 49 years in different countries of the world.
I started my period on d 22nd of march 2010 and it last for 5 days.