How do you use a body support pillow to relieve back pain in 3rd trimester?

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Hey everyone, 

I’m currently in my 3rd trimester and starting to experience quite a bit of back pain, especially at night when I try to get comfortable. I’ve heard that a body support pillow can really help with this, but I’m not sure the best way to use it to actually relieve the pain. Does anyone have tips or personal experience with positioning a body support pillow to ease back pain during these final weeks? Any advice would be super appreciated!