Awww Tegan, it's hard not to be scared about the size of your baby, but you're right fundal height is nothing to go by. Just because you're big doesn't mean it's all baby. Don't forget you've got placenta in there and lots of amniotic fluid. Your baby might be the same size as Lily but you've just got more fluid in there. Also you will have found that you popped out sooner this pregnancy too, this happens as you're already "pre stretched".

All you can do is wait and see. You know that a woman's body is an amazing thing. You WILL be able to birth your baby no matter how big he is.