Sleeping on the right side..

I know that sleeping on the left side is recommended. But with the sore breasts and the growing belly, lying all night in one position is just so frustrating. Lying on my back gives me an immediate backache. I try switching to the right side for a while but it feels so uncomfortable mostly cause I feel guilty for doing something that isn't recommended. No question I guess, just tired of waking up stiff and feeling guilty for wanting to jump straight into a warm bath.