I'm having light cramping on and off, maybe a few minutes apart. It's nothing like the cramps I had with my girls pain wise but it reaches around to my back and into my legs a little. Should I be concerned? Its getting tighter and tighter. I'm almost 31w and both of my girls are preemies. My first at 27w, no idea why I went early and my 2nd at 34w due to PPROM. No fluid is leaking atm and I'm on the Makenna shot.