My contractions have been 10 minutes apart for two hours, pretty much on the dot. But they don't necessarily hurt. It causes some lower pelvic pressure and lower back pressure, but nothing too severe, the pressure doesn't even make me uncomfortable. It also causes my entire stomach to become super tight and hard, which sometimes makes it a little difficult to breath, or makes it feel like I might pee. I tend to have a very high pain tolerance, so I'm worried that I won't be able to tell what the real thing is.