Il be 29 weeks Monday and I feel small like really small how can a baby fit there lol my ribs hurt…

Il be 29 weeks Monday and I feel small like really small how can a baby fit there lol my ribs hurt and everything tho he's an active kid at 15 inches already I need to grow more. I'm so ready for him to be here but at the same time I'm freaking out about labor anyone else feel like this?