Help: Back Labor?

I've been having a dull ache in my lower back and hips that has increased throughout the day to become uncomfortable and slightly painful. It's not constant and honestly reminds me of when I had a kidney infection and small stones a few years ago. It lasts 2 to 5 minutes at a time sporadically throughout the day. My urine is clear and I drink a gallon of fluid every day and have no signs of infection. Is this back labor? Has anyone else had similar symptoms? Can you describe what your back labor was like?