So my dog Pocky gave birth to two healthy puppies!

I have some questions regarding the dam's behavior and health.
1) Sometimes the dam would lie next to her puppies and whine/wiff at me while looking. What is she trying to tell me?
2) Is it okay that the mother would want to leave her nest to sleep somewhere else? She does run back to her nest once the puppies start crying but it worries me.
3) If the mother is in a squatting position above the puppies, does it mean she's trying to nurse the puppies? Sometimes the dam would look at me and whine after doing this.
4) Her breasts seem to be bigger than before. I assume this is because milk is developing. After a puppy nurses from that teat, should it become smaller? I do squeeze the teat a bit to check the teat has been nursed and it does squirt a bit of milk like a pimple [there's no pus, just milk]. Is this a good sign?
5) Very often, the dam would want to move away from the puppies and lay on my lap for awhile. How long should a dam be away from her puppies?