Completely safe to roll from side to side. Hope you get comfy! Try a pillow between your knees, I find it helps my back. Am 18 weeks now
I cannot roll lying down. You can do whatever makes you comfortable and gets the job done.
I am the same I will be 19 weeks tomorrow and I was always a belly sleeper when I turn over at night I just roll I don't sit up or anything it doesn't hurt me I tried sitting up before and got cramps in my legs so I just roll lol