Okay so at first I thought that I was showing signs of being pregnant. My breasts are very sore, more then normal before my periods, and I have been having some of the worst cramping that I have had in a long time as well. Normally I'm very regular with my periods (28 days). My last period was Dec,17. I was expecting my period to start Jan,15, but it started very light on Jan,11. I thought it was implantation bleeding. Now today Jan,12, I threw up this morning but have felt fine the rest of the day. But the bleeding is very heavy and a lot thinner ( almost like water). My breasts are still very sore to touch as well. Is this anything to worry about?