My nipples have been hurting for days now. And I can't figure out why. I'm 18 and my period was last month on the 18. Oct 18. I have irregular periods. My breasts don't hurt but my nipples do. I have no lumps or bruises or anything on them and I can't figure out why they hurt so much. I am sexually active with my partner. Does this mean I could be pregnant? Please help! I don't know what to do! Has anyone else had this problem before and if so were they pregnant?