I'm 15 weeks pregnant & I have scoliosis. I'm not sure if that has anything to do with it. But I've always had my back lock up kind of, it used to happen every once in a while and I'd tense up and then slowly move and I'd be fine. Well now my right lower back is feeling like that every time I move a certain way. So I'm not to sure if this is something I should be really concerned about or if I should just try to maybe crack my back or sleep it off. It's not excruciating pain its just annoying and uncomfortable & hard to move around a lot when it just keeps locking up. Has this happened to any of you guys? Thank you in advance.