I am 21 years of age and I am irregular at times, but not like this... My last period was on January 12, 2011 I completely skipped last month and its the 2nd of March. I have been extremely tired for the past couple weeks more so this past week, my boobs are usually tendar but this time its just my nipples that are hurting, I have had a small amount of cramping but less than if I was on my period, I've been semi moody like I cry easier, and just today and yesterday I have been feeling a little sick to my stomach. I took a pregnancy test a few days ago on the 28th of February and it was negative...Could I still be pregnant? Or what could be wrong with me??