Unexpected back pain during a contraction! Awake at 2:50 am; hungry, had to pee, Sid started moving around, suddenly got hot. As I sat up I felt a twinge in my back, to the left side, that quickly grew very intense as I went through a contraction. Lasted through my trip to the bathroom, sitting on the toilet, coming out. Had to lean my hands on the counter and just breathe for a second. Totally new; my contractions have never been painful before.
Another at about 1:30 pm! Normal painless contractions in between.