Labor vs menstrual cramps

Stephanie
I have pretty severe menstrual cramps every month. I'm talking curl up in a ball and cry while using a heating pad or sitting in a scolding hot shower until my 800mg of Advil kick in - BAD. I take that much Advil every 4 hours for the first day ...after that they are gone.
 I'm wondering how your cramps compared to labor pains. Am I just totally screwed lol?