Re: Baby not getting enough?
It's never wrong to offer the breast. If baby isn't hungry, she'll reject it or suck so lightly that she won't stimulate more than a trickle of milk.
Babies often fuss because they are getting a letdown that is too fast or too slow for their pleasure. I personally don't think that moms should try to do anything about slow letdowns except nurse the baby and let the baby figure out how to generate the flow speed she desires. If you try to make things easy for the baby- for example, some moms try to boost supply so that their babies will get a really rapid milk flow without much effort- then the baby never learns how to get the breast to do what she wants.
Let us know how that Monday weight check goes. If it's okay, then there's really nothing to worry about. You may want to wptweak some of the fine points, but in general good weight gain = everything going just fine.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"