back pains 😔

So my back has been killing me these past few days and I'm so uncomfortable trying to fall asleep. I cant lay on my sides because that hurts my back as well.. I feel like the only way I would be comfy is laying on my stomach!! I'm 22w 3days and my belly isn't really poking out as much as u would think. Do u guys think it's ok to lay on my stomach? I've been told not to do it AT ALL but I also heard it's ok bcus it's not really harming the baby. HELP! My back is killing meeee