I can HIGHLY recommend a full body pillow!!! They're about 5ft long and help you support your back and tummy especially if you are trying to sleep on your side. I was a tummy sleeper but my achy boobs saw a quick end to that. The pillow is fab and is available from Target or online through ebay. I love mine-- DH calls it my "boyfriend" and punches it but I know he uses it when i'm not in bed with him!!!
Hope xoxo