When do u suppose to take an ovulation test if i'm irregular and don't know when i'm going to start my next menstrual cycle?

See a REI specialist: Ovulation tests are frustrating if you're not ovulating (releasing an egg) every month and have irregular periods. We need to find out why you're irregular: polycystic ovarian sydrome (pcos), thyroid or prolactin hormone issues, aging of the ovary, or low hormone levels from exercise, eating disorders, or stress. See a reproductive endocrinologist for tests and treatment to help you get pregnant.