Because i have irregular periods, do i not ovulate?

No: Irregular periods mean you don't ovulate reliably or regularly; if you have spontaneous periods you are ovulating sometimes. Any doctor who works with reproductive age women should be able to help you sort your cycles out better!

Inconsistently: Irregular periods are caused when your body's signals for ovulation and menstruation get confused by hormonal imbalances that can be related to your thyroid (TSH), pituitary (LH/FSH/prolactin), ovaries (estrogen/progesterone). Many external factors can affect the hormones: malnutrition, stress, obesity, for example. Hormonal contraception can help to regulate your periods, which is healthier.