Yes, you "should" be sleeping on your left side (because your livers on your right). No you can't possibley put yourself on your left side and stay there all night if that's not natural for you. My LO is all down my right side, and, like you, I find that alot more comfortable on my right side. If I was hurting her in any way I'm sure she'd move sides. I sleep on my stomach sometimes too. I can't help it. I'm a belly sleeper.
Sleep however you feel comfortable. If you weren't meant to be sleeping like that, your body would let you know!
