I've had back problems since I was a teenager (now 34) I'm 17 weeks pregnant and have been experiencing really bad pains in my coccyx/lower back. It's got so bad that I can't sit down for longer than 30 mins and it's hurting lots when I do my pelvic floor exercises. My hips have started hurting in bed too, I've heard about SPD and wondered if this could be the start and if there's anything I can do to prevent it such as Alexander technique or osteopathic treatment.