for starters i am 17 and sexually active. please dont say anything abt going to the doc because i know i should go. and i will as soon as i get health insurance. I havent gotten my period in a little over 3 monthes. (had some very very light bleeding that lasted a day , but that was after i missed my period for 2 months) i havent had much discompfort my lower back has had a little bit of pain for a few days but nothing huge. my breast have been feeling a little bruised? or tender its hard to discribe. i have taking oveer 13 at home pregnancy test and all of them said negative except one that was invalid( had no lines) i dont know what this could be but its getting me pretty worried and is very stressful. :( please give me some sort of advice and what this could be.