M.T.
My chiro uses the Webster Technique. I used them during my last pregnancy, starting at around 8 wks, and my DD and I still see them. Planning on using them during the next pregnancy as well. It was great. Not the standard 'popping' and 'cracking' that you normally expect from a chiro. I firmly believe that my short labor was due to the fact that I saw the chiro during my pregnancy (it was under 4hrs). And she was pretty much positioned perfectly.
I definetly think you should check it out. It helped me tremedously :)