Sciatic nerve pain.. chiropractor?

So beggining in my late 2nd trimester I would get pain in my lower right back/butt area evey so often. Now (34weeks) since a few days ago it has been constant. It is terrible. I can't sneeze, get up to use the bath room, make meals...and so on..with out being in pain. Has anyone been to a chiropractor and had some relife? Did the pain stop after you gave birth? I do have an appt friday with a chiropractor, but dont know what to expect. Ive never been.