if you dont get your period you dont ovulate hope this helps
How old are you if you do not mind me asking? You usually ovulate on a monthly basis. Sometimes your temp. goes up during the process. Usually two weeks after your menst. cycle. If you have not started you are not going to ovulate. There is a test you can buy at the drug store that can tell you if your preg or not and when you ovulate. Every girl lady woman are different.
The problem is you won't know when you ovulate. Lack of a period indicates lack of ovulation however because a female ovulates before she bleeds it's possible to become pregnant before you see one. You need to see a doctor to find out why you're not having a period and then go from there.