Well it could mean you are going to get your period.
It could also be pregnancy symptoms. I got cramps a lot early in my pregnancy and everything turned out fine.
It could possibly mean you are going to have a very early miscarriage.
There are so many things these symptoms could be but you won't know if it's pregnancy related until you take a test. If I were you I would go and buy a test from the store or wherever rather than wait for an appointment with your doctor because this is obviously bothering you and it would be best to know sooner rather than later what the deal is.
Obviously, if you find yourself in really bad pain then go to the hospital or see your doctor asap.