Hi Westy..
That's so funny because about 6 weeks ago my bub was laying in the same spot.. Off to the right that is.. And my MW said she would prefer him on the left cause when they turn to go down further and engage that they usually turn clockwise which for you would be posterior (mine changed sides so he's now on the left).. So many differing opinions in this whole birth thing isn't there... If you're still getting back pain (assuming bubs hasn't arrived yet) maybe some time on your hands and knees with bum up in the air on a soft surface like you bed for 10 minute stints at a time might help.. Apparently in that position the baby's spine is the heaviest part of their body and it will tend to swing to the lowest lying spot being your front.. You would have to do this on and off throughout the whole day to make a difference now but if he rolled and changed for you labour will be easier and quicker... Thinking of you sweetie...
Dee xoxo