I am 37 weeks tomorrow and the past two night I get this menstrual like cramping feeling in the area between your hip bones and under your belly. It starts off as the menstrual cramps "I'm about to start my period" and then after a little bit the pain gets so bad that it takes my breath away and even stops me dead in my tracks if I'm walking and if I'm laying in bed I cant seem to move my legs or the pain gets worse. this severe pain seems to be mainly on one side. After a bit it goes back to the I'm about to start my period uncomfortable feeling and I feel sick at my stomach and then the severe pain starts up again. It does this for about an hour, the most two before it finally quits. I don't know what this is. Anyone else experiencing this?