Newborn rolling to side in bassinet



I have a newborn (just under 3 weeks old) and we are trying to get her to sleep in her bassinet instead of in our arms. However, each time we put her in the bassinet she turns on her side. It’s just one side and so far she hasn’t turned on her tummy or back to her back. Any recommendations on how we can get her to lay and stay on her back? She’s not a fan of swaddling but I will try anything to be able to sleep in our bed again!