I have heard that a posterior baby can cause back pain so you could be right there.

There's HEAPS of info on websites about ways to turn posterior babies. Just google it and you will be overwhelmed with info. Crawling and swaying your hips while on hands and knees is meant to help. You're meant to avoid reclining position so you should watch TV etc kinda leaning forward.

Also, there's lots of stories of babies that are stubbornly posterior and turn themselves during labour.

GL!!