What does it mean if i started having pms symptoms over 14 days ago with a 24-28 day cycle.?

Depends on symptoms: I'm not sure what you're experiencing from your question, but i can try to give you more information. Periods are largely uncomfortable for most people and can cause irritability, bloating, and headaches. Pms has been shown in scientific literature to affect about 3-8% of menstruating women. You should see your physician to make sure this is not indicative of another problem, like a thyroid issue.