cramping

I need some help. I have been off my period for about 7 days now, I've been cramping pretty bad everyday since I got off and my boobs have been so sore and my husband has told me they look bigger lol, and I feel bloated all the time. I have take a preg test but it came out neg. I've never had this happen after my period. So I'm just wondering if anyone else has had this and what it could possibly be?