Sorry, hermykne, I am not very clear about what you're asking.
When a baby is fully breastfed round the clock and it is going well, then the breasts do not empty. However, if feeds start to be dropped, or shortened, or spaced out, production slows down.
If this happens (mother dropping/shortening feeds/spacing them out) in the early weeks, production will (probably) cease, dwindling to nothing. I wish I had a pound for every time I have seen this happen
This is not quite the case with older babies feeding much less often with an established and very robust milk supply (like yours)...milk production certainly slows but it doesn't disappear. The established, robust, milk supply is also very responsive. The baby/toddler feeding twice or thrice a day gets a cold/fever and doesn;t want to eat any solids - and is on and off the breast a lot. Whoosh! Milk production soars! The mum feels she has a lot more milk, and indeed she has.
It is also responsive the other way, too - not making much more than the baby asks for, so if you try expressing, you won't get much, unless you start feeding more often/expressing more often.
The situation is complicated by the way mothers tend to judge their milk supplies by what they can express : (
An expert baby can often get more out than a pump. So you may say 'I get nothing when I express' but the baby can manage to get something!
At your stage, your breasts will feel 'empty' not because there is no milk (though there probably isn't a massive amount, but that doesn't matter, because your baby doesn't need a massive amount) but because established, robust milk supplies go with breasts that have very little fat in them. See other thread for more on this