I'm 8 weeks and started having severe cramping over 5 weeks ago (before I even knew I was pregnant). It was so bad that I would wake up multiple times every night and eventually started sleeping with a ice pack on my stomach (which for some reason, seemed to help). The doctor put me on duphaston and the cramps decreased. Then recently, I started bleeding for a few days. The pain became so intense I could barely walk. I went to the doctor and had another ultrasound. I was convinced we'd had a miscarriage. Luckily, we didn't. I've got a few issues (fibroids/endometriosis, etc) and the doctor thinks that may be causing my issues, but he doesn't seem really sure. He's increased my dosage and the cramps have significantly decreased and the bleeding has completely stopped. So, even though severe cramps suck, you don't have to expect the worst.
Good luck and hope you are feeling better soon!