I hurt my back last week, and then started my menses. It was unbearable! Profuse bleeding and ripping cramps. It is not a miscarriage because I took a HPT the day after I was due. Now on day 5 of my cycle I'm bleeding worse than the start. I feel that the intense bleeding is caused by my back pain. My back is throbbing chronic pain just below ribs, and when I fully exhale or move suddenly I get a sharp acute pain that takes my breath away. Could this be a herniated disc?