Sleeping position

I feel the most comfortable sleeping on my back but at 17 weeks I'm feeling the weight of my uterus and baby and it is causing back pain. I also read it cuts off nutrients and oxygen to baby. I just do not like sleeping on my side! I don't know if it's just psychological bc I know I can't now but it's the only way I want to. I kept waking up last night just fussy bc I wanted to sleep on my back! Ugh. Anyone else having a tough time adjusting to this? So tired today from tossing and turning all night.