Tail bone pain.. Pregnant?!

OK. I'm 24 wks 2 days pregnant with my first. I recently started having tail bone pain. At first it was very sore, now it has become excruciating. Like almost so bad I could cry. It hurts just about all the time. Sitting, standing, laying down, anything* if I go from sitting to standing there is a horrible indescribable almost unbearable pain- it gets so bad I have to stop moving and re cooperate in the process then it goes to terribly sore/achy again. Laying on my side even hurts and rolling over makes it hurt even more. It hurts to touch or put pressure on. I so far have tried ice packs and soon to try heat. Any ideas of what this could be, how to make it better, if this will effect my pregnancy/delivery, or what should be done? I go to my OB soon and will discuss it with her as well just want some info help advise. Also if anyone else had it this bad what was done for them.

((Not sure if it means anything but a physical therapist and chiropractor said my spine was twisting and my hips and secrum were out of place))