do I have to sleep in my left side?

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I'm 5w 3d pregnant. I know I'll be ok to sleep on my back for the first trimester but I have to switch to the side after that. But does it have to be the left side?  I have had a few surgeries on my left leg and have several scars on that hip that bother me if I lay on it. Is there any other reason besides preventing heartburn that you should sleep on the left? Or will I be ok if I sleep in the right?  

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