I have been trying to comcieve and has yet to happen, but the past three months my periods has been a week or two late. could i not be ovulating?

Not necessarily: You mentioned having been pregnant before, which is a plus. Your gyn dr may advice you on ways to track your ovulation time (there are several dedicated websites to help you with this); and reassure you in terms of your ovulation. Keep trying, and see your dr. Don t stress too much.

Abnormal ovulation: You're right, your history sounds consistent with not ovulating. Have your doctor obtain some hormonal levels on you to rule out any causes where ovulation is compromise.