Baby rolling at 11weeks

Hello mummies, My baby has started to roll from back to tummy at 11 weeks. She just turned 12weeks today. Just wondering if this is normal? 😥She did roll over from tummy to back before she learned this but for now she seems to have forgotten how to roll back and excitedly keep rolling to her tummy. Yesterday she rolled to her tummy while asleep and it woke her up crying. I'm so worried if she does this at night and we don't roll her over back in time cause we are all asleep. Have any mummies experienced this? Did you buy the anti-roll pillows for baby cot? #worriedmummy