Hi, im having periods but not ovulating. Some people dont have periods atall but others do, it depends on the amount of hormones your body is producing.With me my body is producing enough hormones to have a monthly bleed but not to release an egg each month. the only way to find out is to have a day 21 progesterone blood test which is done on the 21st day of your cycle and normally shows if you have ovulated dependent on the hormones present. You may then need further tests. In this situation some people ovulate on certain months but not on others.
How regular your periods are and the length of your cycles can be an indication of ovulation, mine were 35 days long and my doc said it was unlikely i was ovulating based on a cycle that long.
Taking your temperature and keeping an eye on mucus can also help. Hope this helps, Fallen