I'm 19 and have always had regular periods. however, i've just started my period 2 weeks early. i don't know what the reason behind this could be?

Irregular 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. Infections ; hormonal changes can cause spotting. If concerned for pregnancy then do a home pregnancy test . There are options available to regulate the menstrual cycle. The discharge needs a separate evaluation