It looks like you may already have too much advice...but I had this situation w/ my second baby. Here's what I did.
I went to a chiropractor who had experience adjusting pregnant women. I got two adjustments in the last couple weeks of pregnancy. The logic for this adjustment went something like this: the baby is not comfortable head down and facing the back b/c my sacrum was twisted just enough to poke him in the face; a sacrum straightened by adjustment leaves a more comfortable place for the baby to nestle down.
I was also advised never to sit in a reclining position: either lie down or sit up straight w/ both feet on the ground, back straight.
I did lots of cat stretches like the other ladies suggested. I also did the version of that stretch where you extend your arms out along the the floor and leave your butt up in the air (very ladylike ;o).
I also did piriformis stretches (rec'd by chiro for hip pain): sitting on a chair I placed one ankle on the opposite knee and leaned forward while keeping my back straight. I held each stretch for a 25 count and then switched legs for 3 sets per day.
I don't know which thing or combo of things worked, but I was trying to turn the baby and avoid a Occiput Posterior birth (as w/ firstborn) and the baby came out face down and head first, just the way they are supposed to. I DO know that I got overwhelmed by the list of things I couldn't do/had to do every day...esp w/ preg hormones etc. I was pretty discouraged and frustrated and afraid of needing a c-section etc. Keeping your attitude light is really hard, but probably as important as any other proactive things you try :). If you Dr. is stressing you about scheduling a section, you could try to negotiate an extra week of time, but putting it on the calendar doesn't mean you are going to have a c-section. :)
Most babies do finally turn, so your chances are good. Best of luck to you!!!
Emily