Don't worry about sleeping on your left side. The reason for the "left side" push when pregnant is that is suppose to facilitate better blood flow. However, there are many different opinions about this and the main important thing is to keep off of laying FLAT on your back. Because this puts pressure on the vena cava. So if you can lay on your right side more comfortably, do that. If you can lay on your back and then have DH slip a FIRM pillow underneath so you are at a little bit of an angle, on either side, that will work too. Just as long as you are NOT flat on your back.