Advice for Comfortable Sleep

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I’m currently 21 weeks into my first pregnancy and have been experiencing significant discomfort during sleep. While I’m naturally a side sleeper, I find myself predominantly on my left side due to severe heartburn when lying on my right. Sleeping on my back isn’t advisable at this stage, so I’m left with limited options. Consequently, my left hip and shoulder have started to ache, and I suspect my overly soft mattress isn’t helping. Unfortunately, replacing it isn’t feasible right now. Does anyone have suggestions to make sleeping more comfortable under these circumstances?