can you experience pregnancy symptoms and not be pregnant??

I'm not sure what is going on with my body. my menstrual period was real late in December and when i finally got my period it was towards the end of December,  my period only lasted two days light bleeding. In early January I started cramping. I would be camping thinking i was about to start my menstrual because i normally cramp 1 or 2 days before my menstrual, but i didn't experience no bleeding that week, the next week was the same. I have never experienced cramps in the way they have come. The third week nothing . and the fourth week i started cramping again but no period; the cramps last about 2 or 3 days. During the whole time in January as i was experiencing these menstrual like cramps i also experienced bloated, backaches, white discharge, and was extremely gassy. finally i got my period and at first it was light pink the first day, the second day it was brownish, and the third and fourth day it was blood; it was enough blood to fill one pad the hole day. Now that its February i am experiencing those same cramps, bloating and gas. my stomach seems to have harden a little but still soft and my stomach has become slight bigger.  i am starting seeing an almost light yellow sometimes brownish like discharge ... can this be signs of pregnancy or am i dying ?