Might have dried up but since you had baby recently you can stimulate it back. But you have to be dedicated. Rent a hospital grade up because they are the most effective at least for a few weeks. Then pump every 2/3 hours and yes that means waking up to do it at night if you want supply back. Hope it works and drink mothers milk tea, good luck.
Call your doctor, they may have medicine to help stimulate milk production.
Depends. Your milk should've dried up by now. But if your producing milk then maybe.