Yes.Im 20+1 today.This is my 2nd pregnancy,having a boy and im so heavy.I get lower back pain and have to alternate side to side at night because my hips start to hurt.Sometimes ill prop my pillows up and lay on my back to give my hips a break.Later on in about 28 to your 30 week mark it wont be so easy to lay on your back then,as baby gets bigger and u get heavier so enjoy it now lol
As long as ur comfortable you're fine, the baby will let u know if it becomes uncomfortable :)
I had read where someone said laying on your back cuts off their oxygen so I was just curious :)
Im 22 weeks tomorrow i try to sleep on my sides but wake up on my back im sure its fine:)
Sleep on my sides but also lay on my back after getting sick of side to side. After awhile gets uncomfortable so go back to side to side. Enjoy those moments you lie on your back while you still can that's my motto lol x