I had loads of cramping from about 6/7 weeks to 10/11 ish. I think it was probably just everything stretching out. I'm sure it is the same for you, and that baby is just fine. I know for me, it helped when I really guzzled water--like 100-150 ounces a day, and also made sure to sit and rest periodically.
That being said--it probably IS normal. But, listen to your body, and if you feel "off" it never hurts to give your doctor a call just to be sure.
I hope it eases up soon!! : )