At my last u/s last week my daughter's head was so low they couldn't get a look at it hardly. I am 35 weeks as of yesterday, so not much longer to go, but I can sympathise with you for sure! I am sooooo uncomfortable right now I can hardly stand it. I feel as though I have been kicked repeatedly or run over by a truck in the pelvic area. Ouch!
I wish I had some tips for you but have just been putting up with it because I don't know what else to do. I hope you get some good answers though because I want to know too!