Worried early labour at 33 weeks

I keep having pain in pelvic area and back it comes and goes. I haven't lost my plug or had a bloody show or anything but this pain is like intense pushing in the pelvic area. I keep pressing the sides of my stomach and they still squish a little before feeling hard. It hurts my hips to walk around and when I have that pain no amount of walking or changing positions helps. I'm not sure what is happening or if I should call the midwives at L&D.