I have a pain in my lower back on the left hand side. It's pretty bad. It initially felt like a bruise that hurt more when I moved. It hurts all the time now. I've had it for about an hour and it came on very suddenly. Could this be something kicking off? I've no contractions or anything just some period-type cramping all day. Anyone experience anything similar? With my first the contractions woke me up on her due date and it was all systems go.