I've had regular periods until now. recent cycles- 30, 39, 31, 41, 30, and currently on day 45 without starting. def not pregnant. cause for concern?

You may be: approaching an early menopause. Make an appointment with your gynecologist for blood testing (hormone levels) and examination.

Irergular periods: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Hormonal imbalance, PCOS, thyroid disease, weight changes are just a few of the many possible causes. There are many options available to help regulate the menstrual cycle.