I'm now cramping and having lower back pain. I can't wait to find out what is wrong with me):

sounds like your period is coming....

I normally don't get back pain before I start though.

just because you don't normally have it doesn't mean it's not a sign.... every period can be different. try another test, go see a doctor or go to the er & say you're having lower abdominal pain they're check to see if you're pregnant.