Early milestones????!!

My 3 weeks old baby can roll over and hold her head u and will attempt at getting up on her knees?!? How normal is this?? She’s still too weak to actually stay up on her knees but she sure enjoys trying. I’m slightly worried that it’s going to mess with her development or that she’s moving to fast 😬😬 she was born three weeks early and the first time she got up on her knees was at the hospital like RIGHT AFTER she was born 😬😬😬 even the nurses were shocked by how mobile she was already.