Help! Baby will only sleep on her side

Darcy • 31 y/o happily married. Can't have a rainbow w/o a lil rain. 💦🌈 😇mom to 2 Angels &1 rainbow due 3/24/16. IUI/ Clomid
My 1wk old baby girl likes sleeping on her side and it worries me so much that I can't sleep at all (in the little time I can sleep!) we have an arms reach co-sleeper at bed height next to my bed. I am worried about positioning her safely to sleep on back where she can still breathe easily if she happens to get to her side. Ideas?