Ok, so I'm 18 and for the past four months I haven't gotten my period. My cycle has been irregular ever since I got my period about 5 years ago. I took a pregnancy test and it was negative, I also don't have any other symptoms of pregnancy. I really have no idea what's going on. I also have a smallish lump that hurts in my lower right hand pelvic area when I put pressure on it. For a few days I was getting sharp pains that would last about 2-5 seconds quite infrequently though. They have since stopped. I don't know if this is a sign of an ectopic pregnancy or not but any input would be awesome!