Safe Sleeping Positions During Pregnancy: A Guide for Pregnant Women

Question
I'm 19 years old, this is my first baby, and the first day of my last period was Oct.25,2004. Iam 34 weeks pregnant and i am most comfortable on my stomach. Although I try not to i sometimes end up on my stomach sleeping, is this safe?

Answer
We advise that you sleep on your left side so as to take the weight of the uterus off the Vena Cava (the vein that returns blood to your heart). It is not critical that you do not sleep on your stomach. However, it would give better perfusion to your baby if you could sleep on your left side. If you wake up and realize that you are on your stomach, merely turn over and lie on your left side whenever you think of it.