OK, so I got my period on February 4, 2015 and it's already March 25th and my period is still MIA. I took 2 pregnancy test like a week ago, but they were both negative. What throws me off is that Ive been cramping for the last 2-3 weeks but my period never comes. I also have been having headaches, nausea, and a few days ago I actually vomited, but thought it was bcuz of my headache. I'M also super sleepy and tired lately, and today i looked at my breast and my nipples look dark, so I'M all confused. Has anybody gone or is going thru something like this? Any info is greatly appreciated.