I have a regular cycle since i was 16 and i'm 29 now. i'm 3 days late the start spot yest and today i started bleeding . i took pregnant test was neg?

Many options : 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.