It's normal for your breasts to not feel "full" after you've been nursing for a while. Many moms start out with some degree of engorgement/oversupply, which means there's more milk being made than the baby is eating. Every time the baby leaves some leftover milk in the breast, the body gets the message that the extra milk isn't needed and it reduces production a bit. After a while your supply regulates itself to meet your baby's needs very precisely, without a lot of extra milk left over to give you that "full" feeling.
If you are concerned about your milk supply, the best way to gauge production is to count diapers. Good diaper output = good milk input.
If you EBF and only 4 weeks postpartum, the bleeding is probably lochia, which generally lasts around 6 weeks.
also, i stopped bleeding at 2 wks after having ds #2 , and now i think i'm bakc on my AF.. could that be my probleM>???
AF can make your supply dip a bit, but if you feed on demand the decrease will not be permanent. Your baby will feed more frequently in order to make up for getting less milk per feeding, and after a few days of frequent nursing your supply will rebound.
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!"