I know i ovulated on 9/19 bc i always have heavy cramps during that time, so why is period 9 days late. no stress, 24, ttc, neg preg. tests.

Sometimes late: 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. Infections & hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test . There are many options available to help regulate the menstrual cycle. Schedule a visit.