Help! Newborn rolls onto side?


My baby girl is 6 days old and I’ve woken up in the middle of the night multiple times to find that she’s rolled from her back onto her left side. It really freaks me out, because she’s usually in a swaddler and I’m scared that she could end up on her stomach and covering her face. I thought that newborns weren’t able to roll? And how can I stop her from being able to do it? Any advice helps please because it really scares me.