Hi i'm a 18 year old girl. i have had my period for around 4 years now, it has never been late although it has come early and occasionally i've had a 2 week cycle. my concern is, it is very very thick and black constantly i've read everything saying it's

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 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.