I am 33 weeks today! As of Sunday/Monday evening, only in the evenings, I have been feeling what is strikingly similar to what the beginning of back labor felt like with my daughter. I've never had a contraction in my abdomen. These start and stop and come in waves. It's major pelvic, lower back and "rectal" pressure with no need for a bowel movement. I can feel them come on and end. But when I wake up in the morning they are gone. I emailed my Dr just to ask her and she says "sounds like the beginning of labor" and to call the L&D nurse. WHAT?! The nurse thinks maybe it's just what I feel when I finally relax. My body telling me I'm tired. Now, I feel paranoid of pre term labor! Ahh! Just needed to vent. Sorry!