What does this mean? Someone please help?

So maybe a few weeks to a month ago, I noticed green discharge. I've never had sex. So i was supposed to get my period last week and I didn't. But I was PMSing and tender breasts, yea all that. What could this be? Please give me a real explanation don't just say go see a doctor or green isn't a good color. Someone please help. Thanks. Oh and yesterday I think I had cramps, maybe it was abdominal pains? idk