For the last few weeks I have been feeling very bloated especially after I eat. I feel hungry all the time and for the past week my breast have been sore. I also have lower back pain and I keep getting this fluttery feeling in my abdomen. I have also had cramps a few days. This month I got my period BUT it was only 2 days which had never happened to me. I went to the doctor a few days ago and had a blood pregnancy test that came back negative. Could I still be pregnant or what else could be causing all these symptoms?