I agree with getting a pillow- I didn't get a maternity one, just a body pillow- but it helped so much!
I recommend getting a maternity pillow from Amazon. It'll come in handy during the second and third trimester. Like during five months of pregnancy. With Amazon Prime, it ships to your home instantly after purchase and it will come the next day. The best maternity pillows are fifty dollars and above. I have a Snoogle Chic - Snoogle Total Body Pregnancy Pillow of the color Moroccan Gray. Totally works. I sleep like a champion. I have never slept as good on my side as I have with my Snoogle pillow. Literally.