Side Sleepers: Is pregnancy pillow necessary?

I only sleep on my side as it is. I can’t ever fall asleep on my back or on my stomach, and I sleep like a rock so I don’t move in the night. I always wake up in the exact same position I fall asleep in. I also have a pillow I put between my knees and a teddy to cuddle. This has been my sleeping habit since I was a kid.

I’m only 13 weeks right now but I’ve been seeing loads of adverts for Babybub pregnancy pillows and wanted to know if it’s worth it?