I have had SPD and a sore coccyx only after having my baby...finally starting to feel better after 15 weeks...BUT I find that that is the dangerous time as I start to overdo it and then get sore again, because I don't have the pain to remind me.

Could you be overdoing things/forgetting to move in the right way etc because you have not had any pain? That could cause it to flare up.

Marion