cramping at 9 weeks pregnant

Natalie
Tomorrow I'll be 9 weeks pregnant.. I've been having on and off cramping on one side of my abdomen.. sometimes both.. & on and off back pain at the very end of my spine.. No blood.. No spotting.. I've been extremely worried since I don't know what it is.. it's not an ectopic.. so I don't have any idea what may be going on..