I just came of my period 3 days ago, but i came back on today. i wanted to know what that could mean?

Common problem : 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.

Hormonal changes: If you are not on birth control pills and have no other symptoms than more period-like flow, the most likely thing is some fluctuation in your hormones. But it could indicate other problems such as a polyp in the uterus or cervix, or even infection; but that usually causes some pelvic pain/aching. If it continues or new symptoms begin, see your doctor.