Period

So my periods are usually like 5 days long and I’ve been on this one for 14 days now. This has never happened before and I’m on birth control so it should be done by now. I know that if you’re relatively young that your periods should be somewhat irregular, and mine have, it’s just never been this off. Has anyone else experienced this? If so, any ideas on how to get it to stop or do I just wait it out? Thanks in advance.