About a month ago, I was late for my period, I was very emotional, my breasts were tender and I thought for sure I was pregnant. Then about a week or so after my missed period I started having really sporadic cramps that were so bad I had to sit on the floor. After a day or two of these cramps I started what I thought was my period but a large clump the size of a half dollar that was white, grey and bloody came out, and I bled for the next 3 days. What happened?!