P.M.
Progesterone ONLY birth control is safest while breastfeeding... also they started you off kinda early too, usually OBs start the discussion on birth control on your 6 week postpartum visit.
Keep hydrated, eat a healthy diet, add oatmeal and power pump as well as nurse often. Power pumping is pumping every 2 hours and also pump the other breast while infant is on the other side. Stockpile EVERY drop... by month 4-5, your ability to pump will greatly diminish anyways those your supply will actually be greater than it is now.
If this doesn't make you feel your supply is back... look into getting fenugreek WITH Blessed thistle - they work best together than just fenugreek alone. Check out www.kellymom.com for more great info and advice about breastfeeding!